JP2780792B2 - Call transfer method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for transferring a call in a communication system.

2. Description of the Related Art Conventionally, in a communication system including a communication network and a terminal (for example, a telephone set, a facsimile, etc.), a call has been transferred. This is done by setting a call to a call transfer destination terminal.

FIG. 30 is a block diagram of a conventional communication system having a method of setting up a call from a call setting destination terminal to a call transfer destination terminal and transferring the call. The communication system shown in FIG.
It is assumed that one terminal is connected. Reference numeral 3001 denotes a communication network, which includes means 3002 for performing communication between terminals and means 3003 for performing call setting with the terminals. Reference numeral 3004 denotes a terminal 1 having means 3005 for setting up a call with the communication network and means 3006 for performing communication via the communication network. Reference numeral 3007 denotes a terminal 2, two means 3008 and 3013 for setting up a call with the communication network, two means 3009 and 3012 for performing communication via the communication network, and means 3011 for performing communication within the terminal. Means 3014 for requesting call setting with a predetermined call transfer destination as a call setting destination when a call setting is made from the communication network 3001. The terminals 3 to N have the same means as the terminals 1 and 2.

In the above communication system, a procedure when a call set from the terminal 1 to the terminal 2 is transferred to the terminal N-1 will be described with reference to FIG. 30 as an example. The terminal N-1 has the same means as the terminal 1, and means 3016 sets up a call with the communication network of the terminal N-1 and 3017 means communicates via the communication network. First, the terminal 1 as a call setting source sets up a call using a means 3005 for setting up a call with a communication network (procedure). This call setting includes the terminal identifier (terminal 2) of the call setting destination. The means 3003 for setting up a call with the terminal of the communication network sets the call to the means 3008 for setting up the call with the communication network of the terminal 2 (procedure), and the call setting is made from the communication network of the terminal 2. The means 3014 for requesting a call setup with a predetermined call transfer destination as a call setup destination requests the call setup for the terminal N-1 and the means 3013 for making a call setup with a terminal of the communication network of the terminal 2. Performs call setup (procedure). This call setting includes the terminal identifier of the call setting destination (terminal N-1). The means 3003 for setting up a call with the terminal of the communication network sets the call to the means 3016 for setting up the call with the communication network of the terminal N-1 (procedure).
Thereafter, means for communicating via the communication network of terminal N-1
The means 3012 for communicating with the terminal 3017 via the communication network of the terminal 2
Means for performing communication between the terminals of the communication network via the means 3002 for performing communication (procedure) and means for performing communication via the communication network of the terminal 2
3009 communicates with the means 3012 for communicating via the communication network using the means 3011 for performing communication within the terminal, and communicates with the means 3006 for communicating via the communication network of the terminal 1 and the communication network of the terminal 2 Means 3009 for performing communication through means 3002 for performing communication between terminals of a communication network (procedure). Call transfer in the conventional communication system has been performed as described above.

[Problems to be Solved by the Invention] However, the method of transferring a call from a call setting destination terminal to a call transfer destination terminal of the communication system in the above-described conventional technology has the following disadvantages, and it is difficult to solve the disadvantage. Had been an issue.

(1) In a terminal, two means for performing call setting with a communication network, two means for performing communication via the communication network, a means for performing communication within the terminal, and call setting from the communication network. In such a case, a means for requesting call setting with a predetermined call transfer destination as a call setting destination is required, and the terminal becomes complicated.

(2) Two communications are required simultaneously between a communication network and a terminal to transfer one call.

(3) In the method of setting up a call from a call setting destination terminal to a call transfer destination terminal and transferring the call, the call setting destination terminal identifies whether the call setting source terminal is to be used and transfers the call. Indecision.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first object of the present invention is to provide a call transfer method which simplifies a terminal and does not use two simultaneous communications between a communication network and a terminal. A second object of the present invention is to provide a call transfer method that enables a call setting destination terminal to identify a call setting source terminal and determine whether to transfer a call.

[Means for Solving the Problems] The configuration of the call transfer method of the present invention for achieving the first object is as follows. A communication network and a terminal constituting a communication system are based on a predetermined call setting procedure. Means for setting up a call between the communication network and the terminal and means for communicating between the terminals via the communication network; and means for the terminal to notify the communication network of a call transfer destination. The communication network has means for storing and retrieving the notified call transfer destination. First, when a call is set up between the call setting source terminal and the communication network, the call setting destination terminal is set in advance. If the notification of the call transfer destination has been made to the communication network from the communication network, the communication network notifies the call setting source terminal of the stored call transfer destination by the search, and then the call setting source terminal Is characterized in that a new call setup is performed with the call transfer destination as a call setup destination. .

Further, according to the configuration of the present invention for achieving the second object, a communication network and a terminal configuring a communication system perform call setting between the communication network and the terminal based on a predetermined call setting procedure. Means for performing communication between the terminals via the communication network, means for notifying the communication network of a call transfer destination, and means for previously storing and retrieving a code for identifying the terminal. The call setting procedure includes a step of notifying the call setting destination terminal of a code for identifying the call setting source terminal. First, a call performed from the communication network to the call setting destination terminal. If the code for identifying the call setting source terminal notified in the setting is stored in the call setting destination terminal and searched, and it is determined that the call transfer is to be performed, the call setting destination terminal sets the call transfer destination to the call transfer destination. Notification to the communication network, and then the communication network The call transfer destination is notified and the call setting source terminal shall perform a new call setting with the call transfer destination set as the call setting destination, or the communication network and the terminal constituting the communication system are determined in advance. Means for setting up a call between the communication network and the terminal based on the call setting procedure, and means for performing communication between the terminals via the communication network. Means for notifying a transfer destination and means for previously storing and retrieving a code for identifying the terminal, wherein the call setting procedure includes a step of notifying the call setting destination terminal of the code for identifying the call setting source terminal. First, the code for identifying the call setting source terminal notified in the call setting performed from the communication network to the call setting destination terminal is not stored in the call setting destination terminal, and the call transfer is not performed. If it is determined to perform To the communication network, and the communication network notifies the call setting source terminal of the call transfer destination, and the call setting source terminal sets a new call using the call transfer destination as a call setting destination. It is characterized by the following.

[Operation] According to the first aspect of the present invention, if the terminal of the call setting destination notifies the communication network of the call transfer destination in advance, the communication network stores the information and the call setting source terminal transmits the call destination. When a call setup for a terminal is performed, a call transfer destination is notified from the communication network to the call setup source terminal, and the call setup source newly sets up the call transfer destination as a call setup destination. In addition to realizing call transfer without performing communication with a terminal to which the call is set, the configuration of the terminal to which the call is set is simplified.

In the second invention of the present invention, the call setup procedure includes a procedure of notifying the call setup destination of a code for identifying the terminal of the call setup source. A search is performed to determine whether or not there is a call, thereby determining whether or not to perform a call transfer. If it is determined to perform the call transfer, a call transfer source is notified of the call transfer destination via a communication network, and the call is transferred. The transfer source performs call setting with the call transfer destination as a new call setting destination,
A call transfer is realized without performing two communications at the same time and enabling the call setting destination terminal to identify the call setting source and determine whether to perform the call transfer.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

First, an embodiment of the call transfer method according to the first invention of the present invention will be described. FIG. 1 is a block diagram showing an example of a communication system capable of implementing the call transfer method of the first invention. The communication system according to the present embodiment has N terminals 1, 2,..., N connected to the communication network. 101 is a communication network, a means 102 for performing communication between terminals, and a means 103 for performing call setting between terminals.
Means 104 for notifying the call transfer destination, and storing and storing the call transfer destination.
It has means 105 for searching. Reference numeral 106 denotes a terminal 1, which includes a unit 107 for setting up a call with a communication network, a unit 108 for performing communication via the communication network, and a unit 109 for notifying a call transfer destination. The terminals 2 to N have the same means as the terminal 1. Each unit of the communication network and the terminal can transmit and receive information, and changes the internal state by transmitting and receiving information, and transmits and receives information by a finite state machine that transmits information according to the internal state, for example, a packet. The present invention can be realized by a computer device having a device and having software for transmitting and receiving packets from the device based on a predetermined procedure.

FIG. 2 is a diagram showing communication performed when the call transfer method of the first invention is implemented in the communication system shown in FIG. 1 in a case where a call transfer destination terminal has been notified of a call transfer destination to a communication network in advance. network,
It is an example of a message notification procedure between a call setting source terminal and a call transfer destination terminal. FIG. 3 is an example of a message communication procedure between a communication network and a terminal when the notification of the call transfer destination in the above-described call transfer method is performed in the communication system shown in FIG. In FIG. 2, it is assumed that the call transfer destination has been notified in advance by the procedure shown in FIG. This call transfer source is stored in the storage / search means 105 (FIG. 1) of the communication network. Here, when a call setting 201 is performed from the call setting destination terminal, the communication network transmits a call setting reception 202 to the call setting source terminal, and then transmits a call transfer 203. The message of the call transfer 203 includes the call transfer destination notified from the call setting destination searched based on the call setting 201. Thereafter, the release 204 is transmitted from the communication network, the release completion 206 is transmitted from the terminal, and the communication with the communication network ends. In the present embodiment, based on the notification of the call transfer destination of the call transfer 203, call transfer in which the call setting source terminal directly communicates with the call transfer destination without passing through the call setting destination terminal is realized. That is, the call setting source terminal newly transmits the call setting 206 to the communication network with the above-mentioned call transfer destination as the call setting destination, and the communication network transmits the call setting reception 207 to the call setting source terminal, and the call transfer is performed. The call setup 208 is sent to the destination terminal, and the response 2
When the response 210 is transmitted to the call setting source terminal and the response acknowledgment 211 is transmitted to the call transfer destination terminal by 09, communication 212 is performed with the call transfer destination terminal. This communication is transmitted in response to the transmission of the disconnection 213 from the call setting source terminal side, and is transmitted from the communication network to the call transfer destination terminal 214, and subsequently transmitted from the call transfer destination terminal in the reverse of the above. Release 215,216 and release completion 217 transmitted from the call setting source terminal to the communication network in response to the release 215,216
Then, the process is terminated by release completion 218 transmitted from the communication network to the call transfer destination terminal. The notification of the call transfer destination from each terminal to the communication network is performed by the message procedure of FIG. That is, when the terminal side transmits a call transfer 301 including a call transfer destination to the communication network, a release 302 is transmitted from the communication network, and a release completion is transmitted from the terminal side, and the notification is performed.

FIG. 4 shows an example of the configuration of the information element of the above call transfer message, and FIGS. 5 to 8 show examples of the content of each information element. The messages other than the call transfer among the messages shown in FIGS. 2 and 3 can use a message configuration conforming to CCITT Recommendation I.451. Hereinafter, the information elements of the call transfer message and the contents thereof will be described. The call transfer message is used for notifying the call transfer destination or canceling the call transfer destination, and is composed of a protocol identifier, a call number, a message type, and a call transfer destination. The protocol identifier has the contents shown in FIG. , The call number is the content shown in Fig. 6, the message type is the content shown in Fig. 7,
The call transfer destination has the contents shown in FIG. The protocol identifier shown in FIG. 5 is composed of one octet of information and conforms to CCITT Recommendation I.451. The call number shown in FIG. 6 is composed of 2 octets of information, includes a flag indicating the call originating side (0) or the call destination side (1) and the call number value, and conforms to CCITT Recommendation I.451. ing. The message type shown in FIG. 7 is composed of one octet of information,
It consists of an undefined bit pattern in the message type of ITT Recommendation I.451. The call transfer destination shown in FIG. 8 is composed of 15 octets of information. When notifying the call transfer destination, the content of each octet is information obtained by encoding the terminal identifier of the call transfer destination, for example, the telephone number is JIS C6220. When the call transfer is released from the information encoded based on the information, the information is configured by, for example, setting all bits to 0.

Hereinafter, in order to explain the operation and operation of the present embodiment, the notation used in the present embodiment will be described first. FIG. 9 shows the configuration of a communication system used for explaining the notation. 901 is terminal A
And has means A and means b. A communication network B 902 includes means c and d. In the notation used in this embodiment, a description method of a message transmitted and received by a terminal and each means of a communication network is shown in FIGS. 10 (a) to 10 (h). 1001,1002,100
3,1004 is a description method of a message transmitted and received by each means of the terminal, and 1001 is a message reception inside the terminal, for example, a case where the means a of the communication system in FIG. 9 receives a message from the means b. Reference numeral 1002 denotes a message transmission to the communication network, for example, when the means a of the communication system shown in FIG. 9 transmits a message to the communication network B. 1003 is a message reception from the communication network, for example, a case where the means a of the communication system of FIG. 9 receives a message from the communication network B. Ten
04 is a message transmission inside the terminal, for example, when the means a of the communication system in FIG. 9 transmits a message to the means b. 1005, 1006, 1007, and 1008 are methods for describing messages transmitted and received by each means of the communication network, and 1005 is a message reception from a terminal. For example, means c of the communication system shown in FIG.
Receives a message from terminal A. Reference numeral 1006 denotes message transmission within the communication network, for example, when the means c of the communication system of FIG. 9 transmits a message to the means d. Reference numeral 1007 denotes a message reception in the communication network, for example, when the means c of the communication system of FIG. 9 receives a message from the means d. Reference numeral 1008 denotes a message transmission to the terminal, for example, a case where the means c of the communication system shown in FIG. With reference to the notation used in this embodiment, the notation of the procedure of messages transmitted and received by terminals and each means of the communication network will be described with reference to FIG. Eleventh
The figure shows an example of the procedure of a message transmitted and received by the means a of the terminal A of the communication system shown in FIG. FIG. 11 shows that the means a of the terminal A is in the initial state, and when a message α is received from a means inside the terminal A (for example, means b), a message γ is transmitted to the communication network B, and the message If β is received, a message δ
To return to the state again.
FIG. 11 also shows that, in the state shown in FIG. 11, when a message other than α is received from the means inside the terminal A, or when a message other than β is received from the communication network B, the state remains.

Hereinafter, the operation of the above-described embodiment of the first invention will be described. First, the operation of each means will be described.

FIG. 12 shows an example of the procedure of a message transmitted and received by the means for setting up a call with the communication network of each terminal. The means for setting up a call with the communication network of each terminal, when receiving the call setting 1202 from the communication network in the initial state 1201, transmits 1203 corresponding to the communication network, and receives a response confirmation 1204 from the communication network. Sends a communication start 1205 inside the terminal and ends communication from inside the terminal
Receiving 1206, transmitting release 1207 to the communication network, receiving release completion 1208 from the communication network, and returning to the initial state again. The means for setting up a call with the communication network of each terminal is in the initial state 12
In 01, when the call setting is not received from the communication network, the call transfer destination is registered in advance in the means for setting up the call with the communication network, and it is determined that the call transfer is to be performed, the terminal is internally set. The transfer 1209 is transmitted, and the process returns to the initial state. In addition, in the initial state 1201, the means for setting up a call with the communication network of each terminal does not receive the call setting from the communication network. If it is not registered in advance and it is not determined that the call transfer is to be performed, and if it is determined that the call transfer is to be released, the terminal transmits a transfer release 1220 inside the terminal and returns to the initial state again. Also, the means for performing call setting with the communication network of each terminal is such that the call setting is not received from the communication network in the initial state 1201 and the call transfer destination is previously set to the means for performing call setting with the communication network. If it is not registered, it is not determined to perform call transfer, it is not determined to cancel call transfer, and if it is not determined to perform call setup for the communication network, it remains in the initial state, If it is determined that the call setting is to be performed, a call setting 1210 is transmitted to the communication network, a call setting reception 1211 is received from the communication network, and if a response 1212 is received from the communication network, communication is started 1213 inside the terminal. Is transmitted, the communication end 1214 is received from the inside of the terminal, and released from the communication network 1215.
Is received, a release completion 1216 is transmitted to the communication network, and the state returns to the initial state again. Also, after receiving the call setting reception 1211 from the communication network, when receiving from the communication network to the call transfer 1217, the release 1218 is received from the communication network, release complete 1219 is transmitted to the communication network, the call setting 1210 again Send.

FIG. 13 shows an example of the procedure of a message transmitted / received by the means for performing communication via the communication network of each terminal. The means for performing communication via the communication network of each terminal enters the communication state 1303 when the communication start 1302 is received from the inside of the terminal in the initial state 1301, and when the disconnection 1304 is received from the communication network in the communication state 1303, the terminal internal. A communication end 1306 is sent to the server, and the process returns to the initial state. Also, in the communication state 1303, disconnection is not received from the communication network, and if it is not determined that the communication has been terminated, the communication stays in the communication state 1303, and if it is determined that the communication has been terminated, a disconnection 1305 is transmitted to the communication network. The communication end 1306 is transmitted to the inside of the terminal, and the terminal returns to the initial state.

FIG. 14 shows an example of the procedure of a message transmitted and received by the means for notifying the call transfer destination of each terminal. The means for notifying the call transfer destination of each terminal is transferred from inside the terminal in the initial state 1401.
When 1402 is received, call transfer 1403 is transmitted to the communication network, release 1404 is received from the communication network, release completion 1405 is transmitted to the communication network, and the state returns to the initial state again. The means for notifying the call transfer destination of each terminal transmits the call transfer 1403 to the communication network when receiving the transfer release 1406 from inside the terminal in the initial state 1401, receives the release 1404 from the communication network, and Release to net completed
1405 is sent, and the process returns to the initial state.

An example of the procedure of a message transmitted and received by the means for setting up a call with a terminal of a communication network inside the communication network and for each terminal will be described.
Figure 15 shows. The means for performing call setting with the terminal of the communication network transmits a call setting acceptance 1503 to the terminal when the call setting 1502 is received from the terminal in the initial state 1501, and transmits the call setting 1504 to the inside of the communication network. When a response 1505 is received from inside the communication network, a response 1506 is transmitted to the terminal, a communication start 1507 is transmitted to the communication network, a communication end 1508 is received from the communication network, and a disconnection 1509 is transmitted to the communication network. Then, release 1510 is received from inside the communication network, release 1511 is transmitted to the terminal, release completion 1512 is received from the terminal, release completion 1513 is transmitted to the inside of the communication network, and the state returns to the initial state. In addition, call setting 15
If release 1514 is received from inside the communication network after transmitting 04, release 1515 is transmitted to the terminal, release completion 1516 is received from the terminal, and the state returns to the initial state again. When the call setting 1517 is received from the inside of the communication network in the initial state 1501, the call setting 1518 is transmitted to the terminal, the response 1519 is received from the terminal, the response 1520 is transmitted to the inside of the communication network, and the response is confirmed to the terminal. Send 1521, send communication start 1522 inside the communication network, receive communication end 1523 from inside the communication network, send disconnect 1524 to the terminal,
Release 1525 is received from the terminal, release 1526 is transmitted inside the communication network, release completion 1527 is received from the communication network, release completion 1528 is transmitted to the terminal, and the state returns to the initial state again. If a call transfer 1529 is received from the terminal, a call transfer 1530 is transmitted inside the communication network and released to the terminal 1531.
Is transmitted, and a release completion 1532 is received from the terminal, and the terminal returns to the initial state again.

FIG. 16 shows an example of a procedure of a message transmitted and received by the means for performing communication between terminals in the communication network inside the communication network and for each terminal. The means for communicating between terminals of the communication network is in the initial state 16
In 01, when the communication start 1602 is received from inside the communication network, the communication state 1603 is entered, a disconnection 1604 from the communication network or a disconnection 1605 from the terminal is received, a communication end 1606 is transmitted inside the communication network, and the initial state is returned again.

FIG. 17 shows an example of a procedure of a message transmitted / received in the communication network and for each terminal by the means for notifying the call transfer destination of the communication network.
When a call transfer 1702 is received from inside the communication network in 01, a call transfer 1703 is sent to the terminal, a release 1704 is sent inside the communication network, and the state returns to the initial state again.

An example of a procedure of a message transmitted and received by the means for storing and retrieving a call transfer destination of a communication network inside a communication line and for each terminal is described below.
See Figure 18. The means for storing and retrieving the call transfer destination of the communication network is in a state 1803 for retrieving a call transfer destination when a call setting 1802 is received from inside the communication network in the initial state 1801.
The call setting destination is searched for the call transfer destination.If there is no call transfer destination, the call setting 1804 is sent to the inside of the communication network.If there is a call transfer destination, the call transfer 1809 is sent to the inside of the communication network. Return to the initial state. When the call transfer 1805 is received from the inside of the communication network in the initial state 1801, the state where the call transfer destination is stored is stored.
In step 1806, if the call transfer 1805 is a notification of the call transfer destination, the call transfer destination is stored, and if the call transfer is canceled, the call transfer destination is set to none, and the process returns to the initial state again.

FIG. 12, FIG. 13, FIG. 14, FIG. 15, and FIG. 16 show how each means of the communication network and each terminal in FIG.
By the message procedure shown in Fig. 17, Fig. 17 and Fig. 18,
2 shows that the message notification procedure shown in FIG. 2 and the message notification procedure shown in FIG. 3 are realized. The call setting source terminal 1, the call setting destination terminal is the terminal 2, and the call transfer destination terminal is the terminal N. Means 111 for performing call setting with the communication network of terminal 2, means 112 for performing communication via the communication network, means 113 for notifying the call transfer destination, and call setting between the communication network of terminal N 115, means 116 for communicating via the communication network, and means 117 for notifying the call transfer destination. In order to distinguish messages transmitted and received by each means of each terminal for each terminal, for example, a means 10 for setting up a call with the communication network of the terminal 1
The response 1203 transmitted by 7 is described as response 1-1203. In order to distinguish messages transmitted and received by each means of the communication network for each terminal, for example, a means for setting a call with a terminal of the communication network receives a call setting
03 is described as call setting reception 2-1503. It is assumed that the procedures of messages transmitted and received by each means of each terminal to and from the inside of the terminal and the communication network and the procedures of messages transmitted and received by each means of the communication network to the inside of the communication network and each terminal are all in an initial state.

First, a message notification procedure when the call transfer method according to the embodiment of the first invention shown in FIG. 2 is carried out when the call transfer destination terminal has been notified of the call transfer destination to the communication network in advance. Is realized. The means 107 for making a call setup with the communication network of the terminal 1 is a call transfer to the means for making no call setup from the communication network in the initial state 1-1201 and for making a call setup with the communication network. If the call destination is not registered in advance, it is not determined that the call transfer is to be performed, and it is not determined that the call transfer is to be released, and if the terminal 2 is set to the communication network as a call setting destination terminal, If it is determined, call setting 1-1210, that is, call setting 201 is transmitted to the communication network. The means 103 for performing call setting with the terminal of the communication network, when receiving the call setting 1-1502, that is, the call setting 201 from the terminal 1 in the initial state 1-1501, receives the call setting 1-11-1503 to the terminal 1; Call setup reception
202 is transmitted, and call setting 1-1504 is transmitted inside the communication network. Means 107 for setting up a call with the communication network of terminal 1 includes:
A call setting reception 1-1121, that is, a call setting reception 202 is received from the communication network. Upon receiving the call setting 1-1802, that is, the call setting 1-1504 in the initial state 1-1801, the means 105 for storing and retrieving the call transfer destination of the communication network is in a state 1-18 for retrieving the call transfer destination.
03, the call transfer destination is searched, and if the call transfer destination for the terminal 2 is stored as the terminal N, the call transfer 1-1809 is transmitted to the inside of the communication network with the terminal N as the call transfer destination terminal. Return to the state. The means 104 for notifying the call transfer destination of the communication network includes:
Call transfer 1-17 from the inside of the communication network in the initial state 1-1701
02, that is, when call transfer 1-1809 is received, call transfer 1
-1703, that is, the call transfer 203 is transmitted and released inside the communication network 1-1.
Transmit 704 and return to the initial state again. Means 103 for setting up a call with a terminal of the communication network is released from inside the communication network.
514, that is, release 1 to terminal 1 upon receiving release 1704
-1515, that is, release 204 is transmitted. The means 107 for setting up a call with the communication network of the terminal 1 includes a call transfer 1-1217 from the communication network.
That is, it receives the call transfer 203, receives the release 1-1218, that is, the release 204 from the communication network, and transmits the release completion 1-1219, that is, the release completion 205, to the communication network. The means 103 for setting up a call with the terminal of the communication network receives from the terminal a release completion 1-1516, that is, a release completion 2
05 is received, and it returns to an initial state again. The means 107 for setting up a call with the communication network of the terminal 1 transmits the call setting 1-1210, that is, the call setting 206 to the communication network with the terminal N as the terminal to which the call is set. Means 103 for setting up a call with a terminal of a communication network
Is the call setting 1-15 from the terminal 1 in the initial state 1-1501.
02, that is, when the call setting 206 is received, the call setting reception 1-15013, that is, the call setting reception 207 is transmitted to the terminal 1, and the call setting 1-1504 is transmitted inside the communication network. The means 107 for setting up a call with the communication network of the terminal 1 receives a call setting from the communication network.
That is, the call setting reception 207 is received. Means 105 for storing and retrieving the call transfer destination of the communication network is as follows:
Upon receiving the call setting 1-1802, that is, the call setting 1-1504, the state changes to a state 1-1803 for searching for a call transfer destination, and a call transfer destination is searched for.
If the call transfer destination is not stored, the terminal N enters the communication network.
Is transmitted as the call setting destination terminal, and the call setting 1-1804 is transmitted, and the state returns to the initial state again. The means 103 for setting up a call with a terminal of the communication network, when receiving the call setting N-1517, ie, the call setting 1-1804 from inside the communication network in the initial state N-1501, sets the call setting N- 1518, that is, the call setting 208 is transmitted. The means 115 for setting up a call with the communication network of the terminal N includes a call setting N-1202, ie, call setting, from the communication network in the initial state N-1201.
208, and transmits a response N-1203, that is, a response 209, to the communication network. Means 103 for setting up a call with a terminal of a communication network,
Response N-1519, that is, response 209, is received from terminal N, and response N-1520 is transmitted inside the communication network. Means 103 for setting up a call with a terminal of the communication network includes a response 1-1505 from inside the communication network.
That is, it receives response N-1520, transmits response 1-1506, ie, response 210, to terminal 1, and transmits communication start 1-1507 to the inside of the communication network. Means 107 for setting up a call with the communication network of terminal 1
Receives the response 1-11212, that is, the response 210, from the communication network and transmits a communication start 1-1213 to the inside of the terminal. The means 103 for setting up a call with the terminal of the communication network transmits a response confirmation N-1 to the terminal N.
521, that is, a response confirmation 211 is transmitted, and communication starts inside the communication network N
Send -1522. The means 115 for setting up a call with the communication network of the terminal N receives the response acknowledgment N-1204, that is, the response acknowledgment 211, from the communication network, and transmits a communication start N-1205 to the inside of the terminal. The means 108 for communicating via the communication network of the terminal 1 starts communication from inside the terminal in an initial state 1-1501.
That is, when the communication start 1-1213 is received, the state becomes the communication state 1-1303, and the communication with the communication network is performed until it is determined that the communication is ended.
When it is determined that the communication has been completed, disconnection 1-1305, that is, disconnection 213 is transmitted to the communication network, communication termination 1-1306 is transmitted inside the terminal, and the terminal returns to the initial state. The means 107 for setting up a call with the communication network of the terminal 1 receives a communication end 1-1214, that is, a communication end 1-1306 from inside the terminal. Means 102 for performing communication between terminals of the communication network has an initial state of 1-1601.
In the communication start from inside the communication network 1-1602, ie 1-1507
Is received, the communication state becomes 1-1603, and communication with the terminal 1 is performed.
When the terminal 2 receives the disconnection 1-1604, that is, the disconnection 213 from the terminal 1, it transmits a communication end 1-1506 to the inside of the communication network, and returns to the initial state again. Means for setting up a call with a terminal on the communication network
103 receives the communication end 1-1508, that is, the communication end 1-1606 from the inside of the communication network, and transmits a disconnection 1-1509 to the inside of the communication network. Means 102 for performing communication between terminals of the communication network starts communication N-1602 from inside the communication network in the initial state N-1601.
That is, when N-1522 is received, the communication state becomes N-1603, communication 212 is performed with the terminal N, and when disconnection N-1605, that is, disconnection 1-1509 is received from the inside of the communication network, communication end N
-1606 is transmitted, and the state returns to the initial state again. Upon receiving the communication end N-1523, that is, the communication end N-1606 from the inside of the communication network, the means 103 for performing call setting with the terminal of the communication network receives the terminal N
Then, the disconnection N-1524, that is, the disconnection 214 is transmitted. The means 116 for performing communication via the communication network of the terminal N starts communication N-1302 from inside the terminal in the initial state N-1301, that is, the communication start N-
When 1205 is received, the communication state becomes N-1303, communication 212 is performed with the communication network, and when disconnection N-1304, that is, disconnection 214 is received from the communication network, communication end N-1306 is transmitted inside the terminal, and the terminal returns to the initial state. Return. Upon receiving the communication end N-1206, ie, the communication end N-1306, from the inside of the terminal, the means 115 for setting up a call with the communication network of the terminal N transmits release N-1207, ie, release 215, to the communication network. Upon receiving the release N-1525, that is, the release 215 from the terminal N, the means 103 for setting up a call with the terminal of the communication network transmits the release N-1226 into the communication network. The means 103 for setting up a call with the terminal of the communication network receives the release 1-1510, that is, the release N-1526 from the inside of the communication network.
To release 1-1511, that is, release 216. The means 107 for setting up a call with the communication network of the terminal 1 is released 1 from the communication network.
-1215, that is, when the release 216 is received, the release to the communication network is completed 1
−1216, that is, release completion 217 is transmitted, and the process returns to the initial state again. Upon receiving the release completion 1-1512, that is, the release completion 217, from the terminal 1, the means 103 for setting up a call with the terminal of the communication network transmits the release completion 1-1513 to the inside of the communication network and returns to the initial state again. . Means 10 for setting up a call with a terminal of a communication network
3 is release completion N-1527 from inside the communication network, that is, release completion 1
Upon receiving -1513, the mobile station transmits release completion N-1528, that is, release completion 218, to the terminal N, and returns to the initial state again. Upon receiving the release completion N-1208, that is, the release completion 218, from the communication network, the means 115 for setting up a call with the communication network of the terminal N returns to the initial state.

Next, the example of the message notification procedure when the notification of the call transfer destination in the call transfer method of the embodiment of the first invention shown in FIG. 3 is performed in the communication system shown in FIG. 1 is realized. Is shown. The message notification procedure example shown in FIG. 3 is a procedure common to both the case where the terminal notifies the communication network of the call transfer destination and the case where the call transfer is released. First, a case where the terminal 1 notifies the communication network of the call transfer destination will be described. The means 107 for setting up a call with the communication network of the terminal 1 has an initial state 1-1201.
In the case where no call setting is received from the communication network and the call transfer destination is registered in advance in the means for setting up the call with the communication network, and it is determined that the call transfer is to be performed, the transfer to the terminal 1 is performed. -1209 is transmitted, and the state returns to the initial state again. Upon receiving the transfer 1-1402, ie, transfer 1-1209 from inside the terminal in the initial state 1-1401, the means 109 for notifying the call transfer destination of the terminal 1 transmits the call transfer 1-1403, ie, call transfer 301 to the communication network. . In the initial state 1-1501, upon receiving the call transfer 1-1529, that is, the call transfer 301 from the terminal in the initial state 1-1501, the means 103 for performing call setting with the terminal of the communication network transmits the call transfer 1-1530 to the inside of the communication network, A release 1-1531, that is, release 302 is transmitted to the terminal.
Upon receiving the call transfer 1-1805, that is, the call transfer 1-1530 from inside the communication network in the initial state 1-1801, the means 105 for storing and retrieving the call transfer destination of the communication network stores the call transfer destination in the state 1-1801. At 1806, the call transfer destination is stored, and the process returns to the initial state again. Upon receiving the release 1-1404, that is, the release 302 from the communication network, the means 109 for notifying the call transfer destination of the terminal 1 transmits the release completion 1-1405, that is, the release completion 303 to the communication network, and returns to the initial state again. Means 10 for storing and retrieving call transfer destinations of communication network
5 receives the release completion 1-1532, that is, the release completion 303 from the terminal, and returns to the initial state again. Next, a case where the call transfer from the terminal 1 to the communication network is released will be described. The means 107 for making a call setup with the communication network of the terminal 1 is a call transfer to the means for receiving the call setup from the communication network in the initial state 1-11201 and performing the call setup with the communication network. If the destination is not registered in advance and it is not determined that the call transfer is to be performed, and if it is determined that the call transfer is to be released, a transfer release 1-11220 is transmitted to the inside of the terminal, and the terminal returns to the initial state again. The means 109 for notifying the call transfer destination of the terminal 1 receives the transfer release 1-1406, that is, the transfer release 1-1220 from inside the terminal in the initial state 1-1401,
A call transfer 1-1403, that is, a call transfer 301 is transmitted to the communication network. In the initial state 1-1501, the terminal 103 for performing call setup with the terminal of the communication network receives the call transfer 1-1529 from the terminal, that is, the call transfer 30.
Upon receipt of 1, the unit 105 transmits a call transfer 1-1530 to the inside of the communication network and transmits a release 1-1531, that is, a release 302 to the terminal. The means 105 for storing and retrieving the call transfer destination of the communication network is in the initial state 1-1.
In 801, when the call transfer 1-1805, that is, the call transfer 1-1530 is received from the inside of the communication network, the state 1 is stored as the call transfer destination.
In 1806, the call transfer destination is set to none, and the process returns to the initial state again. Upon receiving the release 1-1404, that is, the release 302 from the communication network, the means 109 for notifying the call transfer destination of the terminal 1 transmits the release completion 1-1405, that is, the release completion 303 to the communication network, and returns to the initial state again. Means 105 for storing and retrieving the call transfer destination of the communication network
Returns to the initial state upon receipt of the release completion 1-1532, that is, release completion 303, from the terminal.
It is clear that the message notification procedure shown in the figure can be realized and the call transfer method of the first invention can be implemented.

As is apparent from the above operation, the call transfer method according to the first aspect of the present invention includes two means for setting up a call with the communication network, two means for performing communication via the communication network, and communication within the terminal. A terminal having means for performing call setting from a communication network and means for requesting call setting with a predetermined call transfer destination as a call setting destination is not required, and a communication network for transferring one call is not required. It is possible to provide a communication system having a call transfer method that does not require two communications at the same time between the terminal and the terminal.

Next, an embodiment of the call transfer method according to the second invention of the present invention will be described. FIG. 19 is a block diagram showing an example of a communication system capable of implementing the call transfer method of the second invention. In the communication system according to the present embodiment, it is assumed that N terminals are connected to a communication network. Reference numeral 1901 denotes a communication network which includes a unit 1902 for performing communication between terminals, a unit 1903 for setting up a call with the terminals, and a unit 1904 for notifying a call transfer destination. 1905 is terminal 1.
Means 1906 for setting up a call with the communication network, means 1907 for performing communication via the communication network, and means 1908 for notifying the call transfer destination
And means 1909 for storing and retrieving a code for identifying the terminal. The terminals 2 to N have the same means as the terminal 1. Each means of the communication network and the terminal can transmit and receive information, changes the internal state by transmitting and receiving information, and a finite state machine that transmits information according to the internal state,
For example, the present invention can be realized by a computer device having a device for transmitting and receiving information by packets and having software for transmitting and receiving packets from the device according to a predetermined procedure.

FIG. 20 shows a communication network, a call setting source terminal, a call setting destination terminal, and a call setting terminal when the call transfer is performed when the call transfer method of the second invention is implemented in the communication system shown in FIG. It is an example of a message notification procedure between terminals of a call transfer destination. Also,
FIG. 21 shows a communication network, a call setting source terminal, and a call setting destination terminal when the call transfer is not performed when the call transfer method of the invention shown in FIG. 2 is implemented in the communication system shown in FIG. 3 is an example of a message notification procedure between terminals. In this embodiment,
The procedure of the call setup 2001 includes a procedure of notifying the call setup destination terminal of a code identifying the call setup source terminal. In FIG. 20, first, when the call setting 2001 is transmitted from the call setting source terminal, the communication network transmits the call setting reception 2002 and transmits the call setting 2003 to the call setting destination terminal. The call setting destination terminal determines whether or not to perform the call transfer by searching whether or not the code for identifying the call setting destination notified in the call setting 2003 is stored in advance, and performs the call transfer. If it is determined that the call is forwarded, a call transfer 2004 including the call transfer destination is transmitted to the communication network. In response to this, call transfer 2005 from the communication network and subsequent release
2006 is transmitted to the call setting source terminal, release completion is transmitted from the call setting source terminal to the communication network, and notification to the call setting destination ends. Subsequently, in the present embodiment, based on the notification of the call transfer destination, the call setting source terminal transmits the call setting 2008 using the call transfer destination as the call setting destination. In response, the communication network transmits a call setup 2010 to the call transfer destination terminal, and a response 2011
, A response 2012 is transmitted to the call setting source terminal and a response confirmation 2013 is transmitted to the call transfer destination terminal. Thereafter, communication 2014 is performed between the call setting source terminal and the call transfer destination terminal. Termination of communication 2014 is disconnection from the terminal that set the call 2015
The communication network sends a disconnection 2016 to the call transfer destination terminal, sends a release 2017 from there, sends a release 2018 to the call setting source terminal, and sends a release complete 2019 from there. This is performed by transmitting release completion 2020 to the transfer destination.

FIG. 21 is a diagram showing a code for identifying the call setting source terminal notified in the procedure of initial call setting 2010 → call setting acceptance 2102 → call setting destination 2103 of the call setting source terminal of the call setting source terminal. The terminal determines whether or not to perform call transfer by searching for whether or not the terminal is stored in advance, and transmits a response 2104 when it is determined not to perform call transfer. In response to this, the communication network returns a response 2105 to the call setting source terminal and transmits a response confirmation 2016 to the call setting destination terminal, and thereafter, between the call setting source terminal and the call transfer destination terminal, Communication 2107 is performed. The communication 2107 is terminated by receiving the transmission of the disconnection 2108 from the call setting terminal, the communication network transmitting the disconnection 2109 to the call transfer destination terminal, and transmitting the release 2110 therefrom to the call setting source terminal. release
This is performed by transmitting 2111 and then transmitting release completion 2113 to the call transfer destination by transmitting release completion 2112 from there.

Among the messages shown in FIGS. 20 and 21, the messages other than the call transfer can use a message configuration conforming to CCITT Recommendation I.451. That is, the code used in the present embodiment to identify the call setting source terminal uses the one in the message configuration. For the call transfer message, the configuration example described in the embodiment of the first invention can be used. That is, an example of the structure of the information elements of the call transfer message and the contents thereof is shown in FIG. 4. The call transfer message is composed of a protocol identifier, a call number, a message type, and a call transfer destination.
The protocol identifier has the content shown in FIG. 5, the call number has the content shown in FIG. 6, the message type has the content shown in FIG. 7, and the call transfer destination has the content shown in FIG. The protocol identifier shown in FIG. 5 is composed of one octet of information and conforms to CCITT Recommendation I.451. Sixth
The call number shown in the figure is composed of two octets of information, includes a flag and a call number value, and conforms to CCITT Recommendation I.451. The message type shown in FIG. 7 is composed of one octet of information, and is composed of an undefined bit pattern in the CCITT Recommendation I.451 message type. The call transfer destination shown in FIG. 8 is composed of octet information, and the content of each octet is composed of information obtained by encoding the terminal identifier of the call transfer destination, for example, information obtained by encoding the telephone number based on JIS C6220. Is done.

Hereinafter, the operation of the embodiment of the second invention will be described. First, the operation of each means will be described.

FIG. 22 shows an example of the procedure of a message transmitted and received by the means for setting up a call with the communication network of each terminal. The means for performing call setting with the communication network of each terminal receives the call setting 2202 from the communication network in the initial state 2201,
If you send 03 and receive response 2204 from inside the terminal,
Send a response 2205 to the communication network, receive a response confirmation 2206 from the communication network, send a communication start 2207 inside the terminal, receive a communication end 2208 from inside the terminal, send a release 2209 to the communication network,
Upon receiving the release completion 2210 from the communication network, it returns to the initial state again. When the transfer confirmation 2203 is transmitted inside the terminal and the transfer 2211 is received from inside the terminal, the transfer 2212 is transmitted inside the terminal to return to the initial state again. The means for performing setting does not receive the call setting from the communication network in the initial state 2201 and stays in the initial state if it is not determined to perform the call setting for the communication network, and performs the call setting for the communication network. If determined, send the call setting 2213 to the communication network, receive the call setting reception 2214 from the communication network,
If a response 2215 is received from the communication network, a communication start 2216 is transmitted to the inside of the terminal, a communication end 2217 is received from the terminal, and a release 2218 is received from the communication network. Return to the initial state again. Further, after receiving the call setting reception 2214 from the communication network, the call transfer 2220 is transmitted from the communication network.
Is received from the communication network, the release completion 2222 is transmitted to the communication network, and the call setting 2213 is transmitted again.

FIG. 23 shows an example of a procedure of a message transmitted / received by the means for performing communication via the communication network of each terminal. Means for performing communication via the communication network of each terminal becomes the communication state 2303 when the communication network start 2302 is received from the inside of the terminal in the initial state 2301, and when the disconnection 2304 is received from the communication network in the communication state 2303, the terminal A communication end 2306 is transmitted to the inside, and the process returns to the initial state again. Also, in the communication state 2303, no disconnection is received from the communication network, and if it is not determined that the communication has been terminated, the communication state 2303 remains, and if it is determined that the communication has been terminated, the disconnection 2305 is communicated to the communication network, and the terminal A communication end 2306 is transmitted to the inside, and the process returns to the initial state again.

FIG. 24 shows an example of the procedure of a message transmitted and received by the means for notifying the call transfer destination of each terminal. Means for notifying the call transfer destination of each terminal is: Transfer from inside terminal in initial state 2401
Upon receiving 2402, a call transfer 2403 is transmitted to the communication network, and the state returns to the initial state.

An example of the procedure of a message transmitted and received by the means for storing and retrieving a code for identifying the terminal of each terminal in the present embodiment is 2
One embodiment is conceivable. The first embodiment is shown in FIG. The means for searching for a call transfer destination from the code identifying each terminal is a transfer confirmation from inside the terminal in the initial state 2501.
When 2502 is received, the terminal searches for a code that identifies the terminal.
In step 2503, a code for identifying the terminal is searched, and a code for identifying the terminal is stored, and if it is determined that the call is to be transferred, a transfer 2504 is transmitted to the inside of the terminal. And returns to the initial state again.

FIG. 26 shows a second embodiment of a procedure of a message transmitted / received by means for storing / retrieving a code for identifying a terminal of each terminal. The means for searching for the call transfer destination from the code identifying each terminal is a transfer confirmation from the inside of the terminal in the initial state 2601.
When 2602 is received, a state is searched for a code that identifies the terminal.
2603, a code for identifying the terminal is searched.If there is no storage of the code for identifying the terminal and it is determined that the call transfer is to be performed, a transfer 2604 is transmitted to the inside of the terminal. And returns to the initial state again.

FIG. 27 shows an example of a procedure of a message transmitted / received in the communication network and for each terminal by means for setting up a call with a terminal in the communication network. The means for performing call setting with the terminal of the communication network transmits a call setting reception 2703 to the terminal when the call setting 2702 is received from the terminal in the initial state 2701, and transmits the call setting 2704 to the inside of the communication network. If a response 2705 is received from the inside of the communication network, a response 2706 is transmitted to the terminal, a communication start 2707 is transmitted to the inside of the communication network, a communication end 2708 is received from the inside of the communication network, and a disconnection 2709 to the inside of the communication network is received. Is transmitted, the release 2710 is received from the inside of the communication network, the release 2711 is transmitted to the terminal, the release completion 2712 is received from the terminal, the release completion 2713 is transmitted to the inside of the communication network, and the state returns to the initial state again. If the release 2714 is received from the inside of the communication network after transmitting the call setting 2704 to the inside of the communication network, the release 2715 is transmitted to the terminal, and the release completion from the terminal is completed.
Receives 16 and returns to the initial state again. Also, the initial state 2701
When the call setting 2717 is received from inside the communication network in
Send the call setting 2718 to the terminal, if a response 2719 is received from the terminal, send a response 2720 to the inside of the communication network, send a response confirmation 2721 to the terminal, send a communication start 2722 to the inside of the communication network,
Receives communication end 2723 from inside communication network and disconnects to terminal 2724
, The release 2725 is received from the terminal, the release 2726 is transmitted to the inside of the communication network, the release completion 2727 is received from the inside of the communication network, the release completion 2728 is transmitted to the terminal, and the state returns to the initial state. Also, when a call transfer 2729 is received from the terminal after transmitting the call setting 2718 to the terminal, a call transfer 2730 is transmitted to the inside of the communication network and returns to the initial state again.

FIG. 28 shows an example of a procedure of a message transmitted and received by the means for performing communication between terminals in the communication network inside the communication network and for each terminal. The means for communicating between terminals on the communication network is in the initial state
When a communication network start 2802 is received from inside the communication network in 2801, the communication state 2803 is entered, a disconnection 2804 from the communication network or a disconnection 2805 from the terminal is received, and the communication network ends inside the communication network 28
Send 06 and return to the initial state again.

FIG. 29 shows an example of a procedure of a message transmitted / received in the communication network and for each terminal by the means for notifying the call transfer destination of the communication network. The means for notifying the call transfer destination of the communication network is in the initial state.
Upon receiving call transfer 2902 from inside the communication network in 2901,
A call transfer 2903 is transmitted to the terminal, a release 2904 is transmitted inside the communication network, and the state returns to the initial state.

FIG. 22, FIG. 23, FIG. 24, FIG. 25, and FIG. 26 show how the communication network and each means of each terminal in FIG.
The message procedure shown in FIGS. 20, 27, and 29 is realized by the message procedure shown in FIGS. 27, 28, and 29. The call setting source terminal is terminal 1, the call setting terminal is terminal 2, and the call transfer destination terminal is terminal N. 1910 means for setting up a call with the communication network of the terminal 2, 1911 means for performing communication via the communication network, 1912 a procedure for notifying the call transfer destination 1912, and search for a call transfer destination from a code for identifying the terminal Means 1913, means 1914 for setting up a call with the communication network of the terminal N, 1915 means for performing communication via the communication network, 1916 means for notifying the call transfer destination, and a code for identifying the terminal. Let 1917 be a means for searching for a call transfer destination from. In order to distinguish messages transmitted and received by each means of each terminal for each terminal, for example, means 19 for setting up a call with the communication network of the terminal 1
Response 2205 transmitted by 06 is described as response 1-2205. Further, in order to distinguish messages transmitted and received by each means of the communication network for each terminal, for example, a means for setting up a call with a terminal of the communication network receives a call setting reception transmitted to the terminal 2.
03 is described as call setting reception 2-2703. It is assumed that the procedure of a message transmitted / received by each means of each terminal to / from the inside of the terminal and the communication network and the procedure of a message transmitted / received by each means of the communication network to the inside of the communication network and each terminal are all in an initial state.

First, when the call transfer methods of the first and second embodiments of the second invention shown in FIG. 20 are implemented, a communication network, a call setting source terminal, a call Terminal to set,
Indicates that the message notification procedure between the call transfer destination terminals is realized. In the first embodiment and the second embodiment, most of the procedures of messages transmitted and received by the terminal and each means of the communication network are common. Unless otherwise specified, the following message notification procedures are applied to the first and second embodiments. The description is given using [] if they are common and differ between the first and second embodiments. The means 1906 for making a call setup with the communication network of the terminal 1 does not receive the call setup from the communication network in the initial state 1-2201, and the call setup is performed with the terminal 2 as the call setup destination terminal with respect to the communication network. When it is determined that the call setting is performed, the call setting 1-2213, that is, the call setting 2001 is transmitted to the communication network. Means for setting up a call with a terminal of a communication network 1903
Is the call setting 1-27 from the terminal 1 in the initial state 1-2701.
02, that is, when the call setting 2001 is received, a call setting reception 1-2703, that is, a call setting reception 2002 is transmitted to the terminal 1, and a call setting 1-2704 is transmitted inside the communication network. Means 1906 for performing call setting with the communication network of the terminal 1 includes a call setting reception 1-222 from the communication network.
That is, the call setting reception 2002 is received. The procedure 1903 for setting up a call with a terminal on the communication network includes the following steps: if the call setting 2-2717, that is, 1-2704 is received from the inside of the communication network in the initial state 2-2701, the call setting 2-2718, Send the call setup 2003. Means 1910 for setting up a call with the communication network of terminal 2 includes:
In the initial state 2-2201, the terminal receives the call setting 2-2202, that is, the call setting 2003 from the communication network, and transmits a transfer confirmation 2-2203 to the inside of the terminal. The transfer confirmation 2-2203 includes a code for identifying the call setting source terminal. [First embodiment: The means 1913 for storing and retrieving a code for identifying the terminal of the terminal 2 is in the initial state 2-
In step 2501, a transfer confirmation 2-2502, that is, a transfer confirmation 2-2203, is received from the inside of the terminal, and a state 2-2503 is searched for a code for identifying the terminal. And the call transfer destination is terminal N
Is sent to the inside of the terminal, send 2-2504,
Return to the initial state again. [Second embodiment: The means 1913 for storing and retrieving a code for identifying the terminal of the terminal 2 is in the initial state 2
At -2601, the transfer confirmation 2-2602, that is, the transfer confirmation 2-2203 is received from the inside of the terminal, and the state becomes the state 2-2603 in which the code for identifying the terminal is searched.
If the code for identifying the terminal is not stored and the call transfer destination is the terminal N, the transfer 2-2604 is transmitted to the inside of the terminal, and the operation returns to the initial state again. The procedure 1910 for setting up a call with the communication network of the terminal 2 includes a transfer 2-2211 from inside the terminal, that is, [first embodiment: transfer 2-2504] [second embodiment: transfer 2-
2604], a transfer 2-2212 is transmitted inside the terminal, and the terminal returns to the initial state. The means 1912 for notifying the call transfer destination of the terminal 2 transmits the call transfer 2-2403, that is, the call transfer 2004, to the communication network when the transfer 2-2402, that is, the transfer 2-2122 is received from the inside of the terminal in the initial state 2-2401. And returns to the initial state again. Means 1903 for performing call setting with a terminal of a communication network includes:
The terminal receives the call transfer 2-2729, that is, the call transfer 2004, transmits the call transfer 2-2730 to the inside of the communication network, and returns to the initial state again. The procedure 1904 for notifying the call transfer destination of the communication network is as follows. When the call transfer 1-2902, that is, the call transfer 2-2730 is received from the inside of the communication network in the initial state 1-2901, the call transfer 1-2903, that is, the call transfer 2005, is transmitted to the terminal 1. Is transmitted to the inside of the communication network, and release 1-2904 is returned to the initial state. Means 1903 for setting up a call with a terminal in the communication network transmits release 1-2715, release 2006 to terminal 1 when release 1-2714, release 1-2904, is received from inside the communication network. The means 1906 for setting up a call with the communication network of the terminal 1 receives the call transfer 1-2220, that is, the call transfer 2005 from the communication network, and releases the call 1-22-2, that is, the release 2006 from the communication network.
Received to the communication network, release completed 1-2222, that is, release completed 2007
Send Means for setting up a call with a terminal of a communication network 19
03 receives release completion 1-2716, that is, release completion 2007, from the terminal, and returns to the initial state again. The unit 1906 for performing call setting with the communication network of the terminal 1 transmits the call setting 1-2213, that is, the call setting 2008 to the communication network, with the terminal N as the terminal to which the call is set. The procedure 1903 for setting up a call with a terminal on the communication network includes a step 1903 for receiving a call setting 1-2702, that is, a call setting 2008 from the terminal 1 in the initial state 1-2701.
2703, that is, the call setting reception 2009 is transmitted, and the call setting 1-2704 is transmitted inside the communication network. The unit 1906 for performing call setting with the communication network of the terminal 1 receives the call setting reception 1-222, that is, the call setting reception 2009 from the communication network. Means 1903 for performing call setting with the terminal of the communication network, when receiving call setting N-2717, ie, call setting 1-2704 from inside the communication network in the initial state N-2701, sets the call setting N- 2718, the call setting 2010 is transmitted. Means 1914 for setting up a call with the communication network of terminal N,
In the initial state N-2201, the terminal receives the call setting N-2202, that is, the call setting 2010, from the communication network, and transmits a transfer confirmation N-2203 to the terminal. [First Embodiment: Means 1917 for storing and retrieving a code for identifying the terminal of the terminal N in the initial state N-2501 is a transfer confirmation N-2502, that is, a transfer confirmation N-22 from inside the terminal.
State N-25 in which 03 is received and a code for identifying the terminal is searched.
03, a code for identifying the terminal is searched, and if there is no storage of the code for identifying the terminal, a response N-2505 is transmitted to the inside of the terminal, and the process returns to the initial state again. [Second embodiment: The means 1917 for storing and retrieving a code for identifying the terminal N is a transfer confirmation N-2602 from inside the terminal in the initial state N-2601.
That is, the transfer confirmation N-2203 is received, and a state N-2603 is entered in which a code for identifying the terminal is searched. When a code for identifying the terminal is stored, and a code for identifying the terminal is stored, a response N is sent to the inside of the terminal. Send -2605 and return to the initial state again. The means 1914 for setting up a call with the communication network of the terminal N receives a response N-2204, ie, [first embodiment: response N-2505] from inside the terminal.
When the [second embodiment: response N-2605] is received, response N-2205, that is, response 2011, is transmitted to the communication network. Means 1903 for setting up a call with the terminal of the communication network is a response N-27 from terminal N.
19, that is, the response 2011 is received, and the response N-2720 is transmitted inside the communication network. Means for setting up a call with a terminal of a communication network 1903
Receives the response 1-2705, that is, the response N-2720, from the inside of the communication network, transmits the response 1-2706, that is, the response 2012 to the terminal 1, and transmits the communication start 1-2707 to the inside of the communication network. Means 1906 for setting up a call with the communication network of terminal 1 includes a response 1 from the communication network.
−2215, that is, the response 2012 is received and communication starts inside the terminal.
Send 16. Means for setting up a call with a terminal on the communication network
1903 transmits a response confirmation N-2721, that is, a response confirmation 2013, to the terminal N, and transmits a communication start N-2722 inside the communication network. The means 1914 for setting up a call with the communication network of the terminal N receives the response acknowledgment N-2206, that is, the response acknowledgment 2013, from the communication network and transmits a communication start N-2207 to the inside of the terminal. Means 1907 for performing communication via the communication network of terminal 1 starts communication 1-2302, ie, communication start 1-2216 from inside the terminal in the initial state 1-2301.
When the communication is received, the state becomes the communication state 1-2303, and the communication 2014 is performed with the communication network until it is determined that the communication is completed. When it is determined that the communication is completed, the communication network is disconnected.
Send 2015, send communication end 1-2306 inside the terminal,
Return to the initial state again. Means 1906 for setting up a call with the communication network of terminal 1 receives communication end 1-2217, that is, communication end 1-2306, from inside the terminal. The means 2102 for performing communication between the terminals of the communication network enters the communication state 1-2803 when the communication start 1-2802, that is, 1-2707 is received from the inside of the communication network in the initial state 1-2801, and performs communication 2014 with the terminal 1. Upon receiving the disconnection 1-2804, that is, the disconnection 2015, from the terminal 1, the communication end 1-2806 is transmitted to the inside of the communication network, and the state returns to the initial state. Upon receiving the communication end 1-2708, that is, the communication end 1-2806 from the inside of the communication network, the means 1903 for performing call setting with the terminal of the communication network transmits a disconnection 1-2709 to the inside of the communication network. Means 1902 for performing communication between terminals in the communication network enters the communication state N-2803 when the communication start N-2802, i.e., N-2722, is received from inside the communication network in the initial state N-2801, and performs communication 2014 with the terminal N. When the disconnection N-2805, that is, disconnection 1-2709 is received from inside the communication network, a communication end N-2806 is transmitted to the inside of the communication network, and the state returns to the initial state again. Upon receiving the communication end N-2723, that is, the communication end N-2806, from the inside of the communication network, the means 1903 for performing call setting with the terminal of the communication network transmits the disconnection N-2724, that is, the disconnection 2016, to the terminal N. Means 1915 for performing communication via the communication network of the terminal N becomes the communication state N-2303 when the communication start N-2302, that is, the communication start N-2207 is received from the inside of the terminal in the initial state N-2301, and the communication state N-2303 is established. When 2014 is performed and disconnection N-2304, that is, disconnection 2016 is received from the communication network, a communication end N-2306 is transmitted to the inside of the terminal, and the terminal returns to the initial state again.
Upon receiving the communication end N-2208, that is, the communication end N-2306, from the inside of the terminal, the means 1914 for performing call setting with the communication network of the terminal N transmits release N-2209, that is, release 2017, to the communication network. Upon receiving the release N-2725, that is, release 2017 from the terminal N, the means 1903 for setting up a call with the terminal of the communication network transmits release N-2726 to the inside of the communication network. Means 1903 for setting up a call with a terminal of the communication network is released from inside the communication network.
10, ie, when release N-2726 is received, release to terminal 1 is performed.
11 That is, release 2018 is transmitted. Upon receiving the release 1-2218, that is, release 2018 from the communication network, the means 1906 for setting up a call with the communication network of the terminal 1 transmits release completion 1-2219, that is, release completion 2019, to the communication network, and returns to the initial state. Return to Upon receiving the release completion 1-22712, that is, the release completion 2019 from the terminal 1, the means 1903 for performing call setup with the terminal of the communication network transmits the release completion 1-2713 to the inside of the communication network, and returns to the initial state again. . Upon receiving the release completion N-2727, that is, release completion 1-2713 from the inside of the communication network, the means 1903 for setting up a call with the terminal of the communication network transmits the release completion N-2728, that is, release completion 2020, to the terminal N. And returns to the initial state again. Upon receiving the release completion N-2210, that is, the release completion 2020, from the communication network, the means 1914 for setting up a call with the communication network of the terminal N returns to the initial state.

Next, when the call transfer method according to the first embodiment and the second embodiment of the second invention shown in FIG. 21 is carried out, the communication network and the call setting source when the call transfer is not performed are performed. This indicates that a message notification procedure between the terminal and the call setting destination terminal is realized.
The means 1906 for making a call setup with the communication network of the terminal 1 does not receive the call setup from the communication network in the initial state 1-2201, and the call setup is performed with the terminal 2 as the call setup destination terminal with respect to the communication network. When it is determined that the call setting is performed, the call setting 1-2213, that is, the call setting 2101 is transmitted to the communication network. Means 1903 for performing call setting with the terminal of the communication network, when the call setting 1-2702, that is, the call setting 2101 is received from the terminal 1 in the initial state 1-2701, the call setting accepting 1-2703 to the terminal 1 A call setting reception 2102 is transmitted, and a call setting 1-2704 is transmitted inside the communication network. Means 1906 for performing call setting with the communication network of terminal 1 receives call setting reception 1-2214, that is, call setting reception 2102, from the communication network. Means 1903 for setting up a call with the terminal of the communication network is in the initial state 2
At -2701, the call setup from inside the communication network 2-2717, ie, 1-
When 2704 is received, call setting 2-2718, that is, call setting 2103, is transmitted to terminal 2. Means 1910 for performing call setting with the communication network of terminal 2 receives call setting 222-22, that is, call setting 2103 from the communication network in the initial state 2-2201, and transmits transfer confirmation 2-2203 to the inside of the terminal. . The transfer confirmation 2-2203 includes a code for identifying the call setting source terminal. [First Embodiment:
Means 1913 for storing and retrieving a code for identifying the terminal 2
In the initial state 2-2501, the transfer confirmation 2-2502, that is, the transfer acknowledgment 2-2203 is received from inside the terminal, and the state becomes the state 2-2503 in which the code for identifying the terminal is searched. If no code for identifying the terminal is stored, a response 2-2505 is transmitted to the inside of the terminal, and the terminal returns to the initial state again. [Second embodiment: The means 1913 for storing and retrieving a code for identifying the terminal of the terminal 2 is in the initial state 2-2601.
The transfer confirmation 2-2602, that is, the transfer confirmation 2-2203 is received from the inside of the terminal, and a state for searching for a code for identifying the terminal is set to 2-2603. The code for identifying the terminal is searched, and the code for identifying the terminal is stored. If so, a response 2-2605 is transmitted to the inside of the terminal, and the terminal returns to the initial state again. The means 1910 for setting up a call with the communication network of the terminal 2 receives a response 2-2204, ie, [first embodiment: response 2-2505] [second embodiment: response 2-
2605] is sent to the communication network.
Send 04. Means for setting up a call with a terminal on the communication network
1903 receives the response 2-2719, that is, the response 2104, from the terminal 2, and transmits the response 2-2720 to the inside of the communication network. Means 1903 for setting up a call with a terminal on the communication network receives response 1-2705, that is, response 2-2720 from inside the communication network, and sends response 1
-2706, that is, the response 2105 is transmitted, and communication is started inside the communication network 1
Send -2707. The means 1906 for setting up a call with the communication network of the terminal 1 receives the response 1-2215, that is, the response 2105, from the communication network and transmits a communication start 1-2216 inside the terminal. The means 1903 for setting up a call with a terminal on the communication network transmits a response confirmation 2-2721, ie, a response confirmation 2106, to the terminal 2, and transmits a communication start 2-2722 inside the communication network. Means 1910 for setting up a call with the communication network of the terminal 2 includes a response confirmation 2-22 from the communication network.
06, that is, the response confirmation 2106 is received, and communication starts inside the terminal 2-
Send 2207. Means 1907 for performing communication via the communication network of terminal 1 enters communication state 1-2303 when communication start 1-2230, that is, communication start 1-2216 is received from inside the terminal in initial state 1-2301, and communication is terminated. The communication 2107 is performed with the communication network until it is determined that the communication has been completed.If it is determined that the communication has been completed, a disconnection 1-2305, that is, a disconnection 2108 is transmitted to the communication network, and a communication termination 1-2306 is transmitted to the inside of the terminal. Return to the initial state. Means 1906 for setting up a call with the communication network of terminal 1 includes:
The communication end 1-2217, that is, the communication end 1-2306 is received from the terminal. Means 1902 for performing communication between terminals of the communication network starts communication from inside the communication network in the initial state 1-2801.
02, that is, when 1-2707 is received, the communication state becomes 1-2803,
Communication 2107 is performed with the terminal 1, and when the disconnection 1-2804, that is, the disconnection 2108 is received from the terminal 1, the communication ends in the communication network 1-2806.
And returns to the initial state again. Means 1903 for setting up a call between terminals of the communication network includes communication termination 1-27 from inside the communication network.
08, ie, when the communication end 1-2806 is received, a disconnect 1-2909 is transmitted inside the communication network. Means 1902 for performing communication between the terminals of the communication network receives communication start 2-2802 from the inside of the communication network in the initial state 2-2801, that is, communication state 2-2-2.
In step 2803, communication 2108 is performed with the terminal 2. When disconnection 2-2805, that is, disconnection 1-2709 is received from inside the communication network, communication end 2-2806 is transmitted inside the communication network, and the state returns to the initial state.
Upon receiving the communication end 2-2723, that is, the communication end 2-2806 from inside the communication network, the means 1903 for performing call setting with the terminal of the communication network transmits the disconnection 2-2724, that is, the disconnection 2109 to the terminal 2. Means 1911 for performing communication via the communication network of terminal 2 starts communication from inside the terminal in the initial state 2-2301.
That is, when the communication start 2-2207 is received, the communication state becomes the communication state 2-2303, the communication 2107 is performed with the communication network, and the communication network is disconnected.
04, that is, when the disconnection 2109 is received, communication is terminated inside the terminal 2-
Transmit 2306 and return to the initial state again. Upon receiving the communication end 2-2208, that is, the communication end 2-2306 from the inside of the terminal, the means 1910 for setting up a call with the communication network of the terminal 2 transmits release 2-2209, that is, release 2110, to the communication network. Means 1903 for setting up a call with a terminal of the communication network is released from terminal 2.
25, that is, when the release 2110 is received, it is released to the inside of the communication network.
Send 26. Means for setting up a call with a terminal on the communication network
1903 is a release 1-2710, that is, a release 2-2726, from inside the communication network.
Is transmitted to the terminal 1, release 1-2711, that is, release 2111 is transmitted. Means 1906 for setting up a call with the communication network of terminal 1
Receives release 1-2218, ie, release 2111, from the communication network, transmits release completion 1-2219, ie, release completion 2112, to the communication network, and returns to the initial state again. Upon receiving the release completion 1-2712, that is, the release completion 2112 from the terminal 1, the means 1903 for setting up a call with the terminal of the communication network receives the release completion 1-227 inside the communication network.
Send 13 and return to the initial state again. Means 1903 for setting up a call with the terminal of the communication network is a release completion 2 from the inside of the communication network.
Upon receiving -2727, that is, release completion 1-2713, it transmits release completion 2-2728, that is, release completion 2113, to the terminal 2, and returns to the initial state again. Means 19 for setting up a call with the communication network of terminal 2
10 receives the release completion 2-2210, that is, the release completion 2113, from the communication network, and returns to the initial state again. Therefore, the message notification procedure shown in FIG. 20 and FIG.
It is clear that the call transfer methods of the first and second embodiments of the present invention can be implemented.

As is apparent from this operation, the call transfer method according to the first embodiment and the second embodiment of the second invention can determine whether or not to transfer a call according to a code for identifying a terminal that has set up a call. A communication system having a call transfer method can be provided.

It is to be noted that the present invention can be variously applied according to the gist thereof and can take various embodiments.

[Effects of the Invention] As is clear from the above description, according to the call transfer method of the first invention, in a communication system, two means for making a call to and from a communication network, and via the communication network Communicate 2
Means, means for performing communication within the terminal, and a terminal having means for requesting call setting with a predetermined call transfer destination as a call setting destination when call setting is performed from a communication network, is not required, This has the effect of saving costs required for building a communication system. Further, since two communications are not required at the same time to transfer one call, the communication network can be operated efficiently, and the communication cost can be reduced.

Further, according to the call transfer method of the second invention, it is possible to determine whether or not to transfer the call in accordance with the code for identifying the call setting source terminal in the single U.S. call transfer destination. There is an effect that it is possible to provide a communication system capable of performing or not performing the call transfer according to the circumstances.

[Brief description of the drawings]

FIG. 1 is a block diagram of a communication system capable of implementing the call transfer method of one embodiment of the first invention, and FIG. 2 is a communication diagram showing the call transfer method of one embodiment of the first invention in FIG. Messages between the communication network, the call setting source terminal, the call setting destination terminal, and the call transfer destination terminal when the call transfer destination is notified from the call setting destination terminal to the communication network in advance in the system. FIG. 3 is a diagram showing an example of a notification procedure. FIG. 3 is a diagram showing a call transfer destination in a call transfer method according to an embodiment of the first invention. FIG. 4 is a diagram showing a configuration example of information elements of the call transfer message and their contents, FIG. 5 is a diagram showing an example of the contents of a protocol identifier, and FIG. FIG. 7 is a diagram showing an example of the contents, FIG. 7 is a diagram showing an example of the contents of the message type, and FIG. Shows an example of contents, Fig. 9 is a configuration diagram of a communication system for use in explanation of notation, FIG. 10 (a),
(B), (c), (d), (e), (f), (g),
(H) is an explanatory diagram of a description method of a message transmitted and received by each unit of the terminal and the communication network, FIG. 11 is an explanatory diagram of a notation method of a procedure of a message transmitted and received by each unit of the terminal and the communication network, and FIG. FIG. 13 is a diagram showing an example of a procedure of a message transmitted and received by a means for performing a call setup with a communication network of each terminal. FIG. 13 shows a procedure of a message transmitted and received by a means of performing communication via a communication network of each terminal. FIG. 14 is a diagram showing an example of the procedure of a message transmitted and received by the means for notifying the call transfer destination of each terminal, and FIG. 15 is a diagram showing a means for setting up a call with a terminal of the communication network inside and outside the communication network. FIG. 16 is a diagram showing an example of a procedure of a message transmitted / received for each terminal, FIG. 16 is a diagram showing an example of a procedure of a message transmitted / received within the communication network and for each terminal by means for performing communication between terminals of the communication network, Figure 17 shows that the means for notifying the call transfer destination of the communication network is Shows an example of the procedure of messages sent and received in each end, FIG. 18, stores the call destination network
FIG. 19 is a diagram showing an example of a procedure of a message transmitted and received by the searching means. FIG. 19 is a block diagram of a communication system capable of implementing the call transfer method according to the first embodiment and the second embodiment of the second invention.
FIG. 20 shows a communication network and a call setup when a call transfer is performed when the call transfer method of the first embodiment and the second embodiment of the second invention is implemented in the communication system shown in FIG. FIG. 21 shows an example of a message notification procedure between an original terminal, a call setting destination terminal and a call transfer destination terminal. FIG. 21 shows a call transfer method according to the first and second embodiments of the second invention. FIG. 19 is a diagram showing an example of a message notification procedure between a communication network, a terminal of a call setting source, and a terminal of a call setting destination when a call transfer is not performed when implemented in the communication system shown in FIG. 19; FIG. 22 is a diagram showing an example of a procedure of a message transmitted / received by a procedure for setting up a call with the notification network of each terminal, and FIG. 23 is a diagram showing a procedure of a message transmitted / received by means for communicating via the communication network of each terminal. FIG. 24 shows an example of a procedure. FIG. 24 shows a message transmitted / received by means for notifying a call transfer destination of each terminal. FIG. 25 is a diagram showing an example of a procedure. FIG. 25 is a diagram showing an example of a procedure of a message transmitted / received by means for storing / retrieving a code for identifying a terminal of each terminal in the first embodiment of the second invention. FIG. 27 is a diagram showing an example of a procedure of a message transmitted and received by means for storing and retrieving a code for identifying each terminal in the second embodiment of the second invention, and FIG. 27 is a diagram showing a call between terminals in a communication network. FIG. 28 is a diagram showing an example of a procedure of a message transmitted and received by the setting means in the communication network and for each terminal. FIG. 28 shows a message transmitted and received by the means for performing communication between the terminals in the communication network. FIG. 29 is a diagram showing an example of a procedure of a message transmitted / received by the communication network and each terminal by means for notifying a call transfer destination of a communication network, and FIG. 30 is a diagram showing a terminal of a call setting destination. Describes the conventional method of setting up a call to a terminal from a FIG. 1 is a block diagram of a conventional communication system for clarification. 101: communication network, 102: means for communication between terminals, 103
... Means for setting up a call with the terminal, 104 means for notifying the call transfer destination, 105 means for storing and retrieving the call transfer destination, 106... Terminals 1, 107. Means for setting up a call between 108, means for communicating via a communication network, 109 ...
… Means for notifying the call transfer destination, 1901 …… communication network, 1902…
Means for communicating between terminals, 1903 means for setting up a call with the terminal, 1904 means for notifying the call transfer destination, 1905
... terminal 1, 1906 ... means for setting up a call with the communication network
1907 means for communicating via a communication network, 1908 means for notifying a call transfer destination, 1909 means for storing and retrieving a code for identifying a terminal.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-258540 (JP, A) JP-A-1-120161 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04M 3/54

Claims (3)

(57) [Claims] 1. A communication system comprising: a communication network and a terminal for setting up a call between the communication network and the terminal based on a predetermined call setting procedure; Means for performing communication, the terminal having means for notifying the communication network of a call transfer destination, the communication network having means for storing and retrieving the notified call transfer destination, When the call setting destination is notified from the call setting destination terminal to the communication network in advance when the call setting is performed between the setting source terminal and the communication network, the communication network is set to the call setting source terminal. The call transfer destination stored in the call transfer destination is notified by the search, and then the call setting source terminal sets a new call using the call transfer destination as a call setup destination. 2. A communication system comprising: a communication network and a terminal which configure a call between the communication network and the terminal based on a predetermined call setting procedure; The terminal has a means for notifying the communication network of a call transfer destination and a means for storing and retrieving a code for identifying the terminal in advance. Identify the call setting source terminal notified in the call setting performed from the communication network to the call setting destination terminal, including the step of notifying the setting destination terminal of a code identifying the call setting source terminal. If the code to be set is stored and retrieved by the call setting destination terminal and it is determined that the call transfer is to be performed, the call setting destination terminal notifies the call transfer destination to the communication network, and then the communication network Notifies the call setting source terminal of the above call transfer destination, and the call setting source terminal Is a call transfer method wherein a new call setup is performed using the call transfer destination as a call setup destination. 3. A means for a communication network and a terminal constituting a communication system to perform a call setting between the communication network and the terminal based on a predetermined call setting procedure, and a communication between the terminal and the terminal via the communication network. The terminal has a means for notifying the communication network of a call transfer destination and a means for storing and retrieving a code for identifying the terminal in advance. Identify the call setting source terminal notified in the call setting performed from the communication network to the call setting destination terminal, including the step of notifying the setting destination terminal of a code identifying the call setting source terminal. If the code to be set is not stored in the call setting destination terminal and it is determined that the call transfer is to be performed, the call setting destination terminal notifies the call transfer destination to the communication network. Notify the call setting source terminal of the call transfer destination and the call setting source terminal Is a call transfer method wherein a new call setup is performed using the call transfer destination as a call setup destination.