JP3357730B2 - Exchange system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching system suitable for replacing a system constituting an existing network with a new switching network.

[0002]

2. Description of the Related Art Conventionally, when a system constituting an existing packet switching network is replaced with a new packet switching network, terminals connected to the existing packet switching network are appropriately shifted to the new packet switching network. A method of connecting and performing replacement while checking operation is conceivable. However, according to this method, it is necessary to change the subscriber address (a part corresponding to the network identification information) of the terminal connected to the existing packet switching network. Was. In other words, when the subscriber becomes the called (calling) side, it is necessary to inform the calling (calling) side of the subscriber address relating to the change, and conversely, the subscriber becomes the calling side. In this case, it is necessary to change the called address of the call setting information sent from the terminal.

[0003] It is also conceivable that the service of the packet switching network is completely suspended and the network is switched to a new packet switching network during the suspension period. However, according to this method, the service is suspended, and furthermore, during this period, the system is switched off. Since it is necessary to confirm the correctness of the operation, the service suspension period becomes long, and it cannot be said that this method is appropriate for both the subscriber and the carrier.

[0004]

Therefore, when a system constituting an existing packet switching network is replaced with a new packet switching network, the existing packet switching network and the new packet switching network are made to coexist and the terminal is gradually increased. There has been a demand for a switching system which can be transferred without changing the subscriber address (corresponding to the network identification information) of the terminal of the system.

SUMMARY OF THE INVENTION The present invention has been made based on the above-mentioned demand, and an object of the present invention is to replace a new packet-switched network with a new packet-switched network and to make terminals gradually exist by coexisting the existing packet-switched network and the new packet-switched network. Can be migrated, and
An object of the present invention is to provide a switching system in which it is not necessary to change a subscriber address (a part corresponding to network identification information) of a terminal of the system.

[0006]

Therefore, according to the present invention, when a call connection information which is connected to a terminal and sent from the terminal is a call connection request for the system, a call connection is attempted in the system, When the call connection is not established due to the absence of the destination terminal, a terminal corresponding means for transmitting the call setting information as call setting information to the first network side, and a second network connected to the second network. If the call setup information sent from the network is a call connection request for the system,
A call connection is attempted in the system, and when the call connection is not established due to the absence of the destination terminal, a second call for transmitting the call setting information as call setting information to the first network side.
Receiving the call setting information to the first network side sent from the terminal corresponding means and the second network corresponding means, the first network being connected to the first network; And a first network corresponding means for requesting a call connection attempt within the network.

Further, according to the second invention of the present application, when the call setting information transmitted from the terminal is a call connection request for the system, a call connection is attempted in the system, and the call connection is attempted. Terminal connection means for setting temporary network identification information of the first network in the destination network identification information of the call setting information when the connection is not established due to the absence of the destination terminal; If the call setting information sent from the second network is a call connection request for the system, a call connection is attempted in the system, and the call connection is not established due to the absence of the destination terminal. When
A second network corresponding unit for setting temporary network identification information of the first network as destination network identification information of the call setting information and transmitting the same, and the terminal corresponding unit, connected to the first network, In response to the call setting information sent from the second network corresponding means, the temporary network identification information of the first network set in the destination network identification information of the call setting information is used as the intrinsic network identification information of the first network. And first network corresponding means for changing the network identification information of the system set in the source network identification information of the call setting information to temporary network identification information and transmitting the temporary network identification information to the first network. A switching system was constructed.

Further, according to the third aspect of the present invention, when the call setup information transmitted from the terminal is connected to the terminal and is a call connection request for the system, a call connection is attempted in the system and the call connection is attempted. When the connection is unsuccessful due to the absence of the destination terminal, terminal corresponding means for setting the temporary identification information of the first network in the destination network identification information of the call setting information and transmitting the same, and connected to the second network. If the call setting information sent from the second network is a call connection request for the system, a call connection is attempted in the system, and the call connection is not established due to the absence of the destination terminal. A second network corresponding means for setting temporary network identification information of the first network as destination network identification information of the call setting information and transmitting the same, and the terminal corresponding means connected to the first network, Call sent from the second network corresponding means Receiving the fixed information, changing the temporary network identification information of the first network set in the destination network identification information of the call setting information to the intrinsic network identification information of the first network, and While the network identification information of the system set in the source network identification information is changed to temporary network identification information and transmitted to the first network, the destination network identification of the call setting information sent from the first network is performed. The temporary network identification information of the system set in the information is changed to the true network identification information of the system, and the network identification information of the first network set in the source network identification information of the call setting information is changed. The switching system is constituted by having first network corresponding means which is changed to temporary network identification information and taken into the system.

[0009]

According to the present invention, when the switching system is replaced with an existing first network, the existing first network and the second network are replaced.
By connecting the switching system to the other network, the call setting information sent from the terminal connected to the switching system or the call setting information sent from the second network is a call connection request to the inside of the system. In the case of, a call connection is attempted in the system, and when the call connection is not established due to the absence of the destination terminal, the call setting information is transmitted as call setting information to the first network side. The call connection is also attempted in the first network, and the call connection is made regardless of whether the called terminal is connected to the switching system or the existing first network.

According to the second aspect of the present invention, when the switching system is replaced with an existing first network, the switching system is connected between the existing first network and the second network. Accordingly, when a call is made from a terminal connected to the switching system or when the call setting information sent from the second network is a call connection request for the inside of the system,
If a call connection is attempted in the system and the call connection is not established due to the absence of the destination terminal, temporary network identification information of the first network is set as destination network identification information of the call setting information and transmitted. Further, since this is captured and transmitted to the first network in the form of the intrinsic network identification information, call connection is attempted also in the first network, and the called terminal is connected to the switching system or the existing first network. The call connection is made regardless of which of the networks is connected.

Further, according to the third invention of the present application, the second invention
In addition to the above invention, the temporary network identification information of the system set in the destination network identification information of the call setting information sent from the first network is changed to the intrinsic network identification information of the system, and the call setting information of the system is changed. Since the network identification information of the first network set in the source network identification information is changed to temporary network identification information and taken into the system, the first network is configured similarly to the system. , Whether the calling terminal and the calling terminal are in the first network or in the system,
A cross-search of the called terminal becomes possible between the system, the first network, and the second network, and an accurate call connection is made.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a switching system according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a configuration diagram of a switching system (network) 100 according to an embodiment of the present invention. This switching system 100 is assumed to be a packet switching network. The switching system 100 is assumed to be newly introduced in place of the existing network 7 which is an existing packet network (for example, TG-VAN). The external network 6 is, for example, a DD
Conventionally, this is a packet switching network that is connected to the existing network 7 and has a terminal (DTE) connected to the mutual network for data transmission, such as an XP network.

An exchange link controller 1 for controlling the exchange link 2 is connected to the exchange system 100. The exchange link controller 1 transmits packets sent from the respective controllers connected to the exchange link 2 to other necessary packets. Control is performed to reach each control unit. The in-network corresponding control units 3-1 to 3-4 connected to the switching link 2 are the control units that execute packet processing in the switching system, and include a terminal (DTE) 8
-1 to 8-6 or the intra-network lines 9-1 and 9-2 are connected.

FIG. 2 shows an in-network correspondence control unit 3-1 to 3-3.
-4 is shown. Correspondence control unit 3-1 in the same network
3 to 4 are composed of a packet processing unit 11 and a line control unit 14. 21 interface conditions are realized. Packet processing unit 11
Has a memory 13 for buffering packets.
And storage means 12 for storing identification information of connected terminals.

The external network control unit 4 connected to the switching system 100 is a control unit for transmitting and receiving packets to and from the external network 6, and its detailed configuration is shown in FIG. . That is, the external network control unit 4 includes the packet processing unit 15
And a network interface unit 17, and the CC
ITT Recommendation X. It is configured to realize 75 interface conditions. The packet processing unit 15 includes not only a memory (not shown) for buffering packets, but also a call control memory 16 including a queue register in which a call waiting for a call connection is set. I have.

The existing network control unit 5 connected to the switching system 100 is a control unit for transmitting and receiving packets to and from the existing network 7, and its detailed configuration is shown in FIG. It has the same configuration as the external network control unit 4. That is, the existing network control unit 5 is composed of a packet processing unit 15 and a network interface unit 17, and is based on CCITT Recommendation X. It is configured to realize 75 interface conditions. The packet processing unit 15 includes not only a memory (not shown) for buffering packets, but also a call control memory 16 including a queue register in which information on a call waiting for a call connection is set. Provided. Further, the packet processing unit 15 of the existing network control unit 5
Is configured to perform control based on the flowchart shown in FIG.

Each control unit of the above exchange system 100 includes:
Upon receiving a call setting packet (call setting information), a call connection process is executed. Here, FIG. 4 shows a format of the call setting packet. The call setup packet has a packet header including a synchronization word or the like at the beginning, followed by the calling DTE address length and the called DTE address length, and further includes the called DTE address and the calling DTE address. Continue. A facility length is added to the end of the call setting packet.
The above-mentioned called DTE address or calling DTE address is, as shown in FIG.
Indetification Code), PNIC (Private data Net)
Work Indetification Code), that is, network identification information is added, and subsequently, identification information of the terminal (DTE) itself is set.

In the exchange system according to the above embodiment,
Packet processing unit 1 of correspondence control units 3-1 to 3-4 in the same network
1 is constituted by a CPU and performs a call setting process based on the program of the flowchart of FIG. 6, which will be described. When the system is activated and the program is started, the packet processing unit 11 waits for the arrival of call setting information (call setting packet) (21). When the call setting information arrives, the packet processing unit 11 stores the destination information (called DTE address) in the call setting information. Uptake analysis is performed (22). Based on the result of this analysis, the identification information (DNIC, PNI) of the network indicates whether the call is within the same network.
C) (23), if it is detected that the destination is a terminal in the same network, a call connection process for the same network is executed (24), and a terminal outside the same network is set as the destination. If this is detected, a call connection process to the outside of the same network is executed (25). In other words, when it is detected that the terminal is outside the same network, the call setting information is transmitted to the exchange link 2 and transmitted to the external network control unit 4 under the control of the exchange link control unit 1. To do. In the case of a call to the same network, the network identification information (DNIC, PNIC) can be omitted.

FIG. 7 is a flowchart showing the detailed operation of the call connection processing for the same network in step 24 described above. The packet processing unit 11 detects whether or not they match based on the connected terminal identification information in the storage unit 12 and the identification information of the terminal itself of the called address in the call setting information (26). It is checked whether it is connected to the control unit (27). Here, when it is detected that the destination terminal is connected to the same network control unit, a call connection process is performed by a route via the same network control unit, and packets arriving thereafter are sent to the corresponding terminal. Send (2
8). On the other hand, when it is detected that the destination terminal is not connected to the same network control unit, control is performed so that the call setting information is transmitted to another same network control unit via the exchange link 2 (29). ). In the other same network control unit, the packet processing unit 11 detects whether or not they match, based on the connection terminal identification information in the storage unit 12 and the identification information of the terminal itself of the called address in the call setting information, and responds. Will be returned. The other identical network control units here include the identical control units of exchanges having other similar configurations connected via the intra-network lines 9-1 and 9-2. After waiting for a response (30), the response is accepted and analyzed (31). As a result of the analysis, it is detected whether or not the response indicates that the destination terminal does not exist in the network (in the switching system 100) (32), and the destination terminal exists in the network (in the switching system 100). If it is found, call processing corresponding to the busy of the called terminal is performed (34). On the other hand, in the network (the switching system 10)
0), it is determined that the destination terminal does not exist.
(33).

The details of the processing for making a call request to the existing network 7 in step 33 described above are shown in the flowchart of FIG. That is, the packet processing unit 11 detects whether the network identification information (DNIC, PNIC) of the switching system is set in the called DTE address in the call setting information (call setting packet) (35), and is set. In this case, this is converted into temporary network identification information of the existing network 7 and transmitted to the exchange link 2. In this embodiment, since the existing network 7 is replaced by the switching system 100, the existing network 7 and the intrinsic network identification information (DNI) of the switching system 100 are replaced.
C, PNIC) are the same, and to distinguish them,
The temporary network identification information set in a register in advance is used. In step 35, when it is detected that the network identification information (DNIC, PNIC) of the switching system is not set in the called DTE address in the call setting information (call setting packet), the temporary network of the existing network 7 is detected. And sends it to the exchange link 2 (37).

On the other hand, the packet processing unit 15 of the control unit 5 for the existing network, which operates by receiving the call setting information from the switching system 100 or the existing network 7, is constituted by a CPU. Is performing call processing. That is, the packet processing unit 15 of the existing network control unit 5 waits for the arrival of the call setting information (call setting packet) (38), and when the call setting information arrives, based on the calling DTE address, the exchange concerned. Whether the call is from the system 100 or from the existing network 7 is detected (39). Here, the switching system (network) 1
In the case of the call from 00, since the called DTE address has been changed to the temporary network identification information of the existing network 7, this is changed back to the intrinsic network identification information of the existing network 7, and the The network identification information of the switching system 100 is converted into temporary identification information and transmitted to the existing network 7 (40). Of course, the network identification information in the calling DTE address is
If it is not 00 (that is, if it is the network identification information of the external network 6), the conversion related to the calling address is unnecessary and is not performed. On the other hand, if it is detected in step 39 that the call is not the call from the switching system (network) 100 but the call setting information sent from the existing network 7, the switching system adds the switching system to the called DTE address. (Net) 1
Since the temporary identification information of the existing network 7 is set in the calling DTE address, the temporary identification information of the switching system (network) 100 is returned to the original identification information of the switching system (network) 100. And transmits it to the exchange link 2 (41). In this way, the existing network 7 is the calling side, and the transmission / reception of packets via the existing network control unit 5 is controlled using the temporary identification information.

Further, the packet processing unit 15 of the external network control unit 4 which operates by receiving the call setting information from the switching system 100 or the external network 6 performs call processing according to the flowchart of FIG. . That is, the packet processing unit 15 of the existing network control unit 4 is waiting for the arrival of the call setting information (call setting packet) (42), and when the call setting information arrives, based on the calling address, the switching system concerned. Whether the call is from 100 or from the external network 6 is detected (43). Here, if the call is from the switching system (network) 100, since the external network 6 is the called side, the call setting information is sent to the external network 6 (47). On the other hand, if the call is not from the switching system (network) 100 but is sent from the external network 6, the external network 6 is the calling side and the switching system (network) 100 is called. Calling side. Therefore, the packet processing unit 15 of the external network control unit 4 transmits the call setting information to the in-network correspondence control units 3-1 to 3-4 and the like in order to try a call connection in the switching system (network) 100. Transmission to the exchange link 2 is performed in such a manner as to be transmitted into the network (4
4). Then, it waits for a response related to a call connection from within the network, such as the in-network correspondence control units 3-1 to 3-4, and detects whether the called terminal is present in the switching system 100 from the contents thereof. (45). Here, when it is detected that the called terminal does not exist in the switching system 100, the called DE is called.
The network identification information of the switching system in the T address is converted into temporary network identification information of the existing network 7 and transmitted to the switching link 2;
It is taken into the existing network control unit 5 (46). On the other hand, when it is detected that the called terminal exists in the switching system 100, it is determined whether the call connection is impossible for another reason (busy or the like) (48). The call connection trial is continued in the switching system (network) 100, and if the call connection is impossible for another reason (busy or the like), corresponding processing (call disconnection) is performed (4).
9).

As described above, in the switching system 100 according to the embodiment, for a call having the switching system (network) 100 as a called side, first, the switching system (network) 10
If a call connection within 0 is attempted and the call connection is not made because there is no called terminal, a predetermined portion of the call setting information is operated to make a call request to the existing network 7. Try. As a result of performing a call connection by operating a predetermined part of the call setting information to make a call request to the existing network 7 as described above, when a call connection is made in the existing network 7, If a packet switch is performed and a call connection is still not made, a call disconnection is performed.

FIG. 11 shows the configuration of the existing network 7 which is replaced by the above switching system 100. The existing network 7 is connected to an exchange link control unit 50 for controlling the exchange link 51. The exchange link control unit 50 transmits packets sent from each control unit connected to the exchange link 51 to other control units. Is controlled as follows. The in-network correspondence control units 52-1 to 52-4 connected to the exchange link 51 are control units that execute packet processing in the existing network, and are terminals 56-1 to 56-6 or in-network. Lines 57-1, 57
-2 is connected. Correspondence control unit 52-1 to same network
The configuration diagrams of 52-4 and the external network control units 53-1 and 53-2 are as shown in FIGS. 2 and 3, respectively. However, unlike the control unit of the switching system 100, the configuration diagram in the network is different. If a call connection is attempted and the call connection is not made because the called terminal does not exist, it is not possible to perform a predetermined portion of the call setting information to make a call request to the existing network 7 and attempt the call connection. Absent. That is, in such a case, the call disconnection process is immediately executed.

FIG. 12 shows an intra-network correspondence control unit 52-1.
The flowchart of the operation performed by the packet processing unit 11 of .about.52-4 is shown. When the system is activated and the program is started, the packet processing unit 11 waits for the arrival of call setting information (call setting packet) (61). When the call setting information arrives, the packet processing unit 11 transmits the destination information (called DTE address) in the call setting information. Uptake analysis is performed (62). Based on the result of this analysis, it is detected from the network identification information (DNIC, PNIC) whether the call is to the external networks 6 and 100 (64), and when it is detected that the destination is a terminal in the same network. Executes a call connection process for the same network (65),
If it is detected that the destination is 100 terminals,
Execute call connection processing for the external networks 6 and 100 (6
3). That is, when it is detected that the terminal of the external network 6 or 100 is the destination, the call setting information is transmitted to the exchange link 51.
To the external network control units 53-1 and 53-2 under the control of the exchange link control unit 50. In executing the call connection processing for the same network, it is determined whether or not the destination (called) terminal exists (66), and the existing network 7 is determined.
If the destination (called) terminal does not exist in the
Execute 7).

On the other hand, external network control units 53-1 and 53-2
The packet processing unit 15 performs call processing according to the flowchart of FIG. That is, the external network control unit 53-
The packet processing units 1 and 53-2 are waiting for the arrival of the call setting information (call setting packet) (71), and when the call setting information arrives, fetch the destination information (the called DTE address) therein. analyse. Based on the result of this analysis, it is determined whether the call is from the external network 6 (100) or not.
(NIC, PNIC) (72), and when it is detected that the destination is a terminal of the predetermined external network, the call setting information is transmitted to the predetermined external network (76). In contrast,
When it is detected that the call from the external network 6 (100) is directed to the terminal of the existing network 7, a call connection process for the existing network is executed (73), and the call connection to the same network is performed. In the execution of the call connection processing, it is determined whether or not the destination (called) terminal exists (74). If the destination (called) terminal does not exist in the existing network 7, the call disconnection (75) is executed. I do.

The switching system 100 operating as described above
The procedure for replacing the existing network 7 in stages will now be described. Before the replacement, as shown in FIG. 14, the existing network 7 and the external network 6 are connected by the line X2, the terminals S11, S14, S21, and S26 are connected to the existing network 7, and the terminals S16 and S24 are connected. It is connected to the external network 6. Here, the terminal S11 is a representative for making a call to the terminal S21 in the existing network 7, and the terminal S21 is a terminal S21 in the existing network 7.
As a representative called from the terminal 11, the terminal S14 is connected to the external network 6.
The terminal S24 is a representative for calling the terminal S24 of the existing network 7, and the terminal S24 is a representative for calling the terminal S14 of the existing network 7.
16 is a representative for making a call to the terminal S26 of the existing network 7,
The terminal S26 is shown as a representative that is called from the terminal S14 of the external network 6, and the types of the calling routes are classified into three types shown by (a), (b), and (c). M1 of the switching system 100 indicates a component corresponding to the same network corresponding control unit, M2 indicates a component corresponding to the external network control unit 4, and M3 indicates a component corresponding to the existing network control unit 5. Is shown.

In the above, the terminals S11, S14, S21 and S26 connected to the existing network 7 are connected to the switching system 1
00 (this network is a new TG-VAN), first, as shown in FIG. 15, the existing network 7 and the switching system 100 are connected by the line X3.
Next, as shown in FIG. 16, the switching system 100 and the external network 6 are connected by the line X1, the line X2 is disconnected, and the terminal S14 is shifted to the switching system 100. The terminal (S14) that makes a call to a place other than the existing network 7 shifts at this stage because the external network control units 53-1 and 53-2 corresponding to the line X3 of the existing network 7 are different from the network 7. It is configured to handle outgoing calls to an external network having network identification information, and a network having temporary network identification information of the switching system 100 is connected as far as a call is made via this line X3. This is because the following operation is performed.

In the connection state shown in FIG. 16, a terminal (typically S12) for making a call to a terminal connected to another network is connected to the switching system 100.
A terminal receiving a call from another network terminal to the existing network 7 (S22
Are allowed to be connected. Therefore, in addition to the routes (a), (d), and (e) shown in FIG. 16, it is possible for the terminal S12 to communicate with the terminal S22 by making a call as shown in FIG. Note that the terminal S1
4 and the terminal S24 are call-connected under the normal control of the external network control unit 4, and the terminals S16 and S26 operate the network identification information by the external network control unit 4 and the existing network control unit 5. After a call connection trial is once performed in the switching system 100 by the control, the call connection is made in the existing network 7, and the terminals S12 and S22 are connected to the network by the same network control unit 3-1 and the existing network control unit 5. After the call connection is tried once in the switching system 100 by the operation control of the identification information, the call is connected in the existing network 7. That is, the exchange system 100 of the present embodiment
, A call can be made and a call can be made using a conventional address without causing the subscriber to change the network identification information.

Next, a pair of terminals S13 and S23 for setting up a call in the switching system 100 are connected to the switching system 100. Accordingly, the pair of terminals S11 and S21 for performing the call setting in the existing network 7 are transferred to the switching system 100 in pairs or the calling terminal 11 first. This is indicated by the symbols in parentheses in FIG. The route (g) originating the call from the terminal S13 and reaching the terminal S23 is formed by ordinary call connection control by the control unit 3-1 in the same network.

FIG. 19 shows a terminal 22 that receives a call from the terminal 12 connected to the switching network remaining in the existing network 7.
The transition to the switching system 100 is shown. In this example, a pair of terminals S11 for performing a call setup in the existing network 7,
About S21, it indicates that the terminal 11 on the calling side can be shifted to the switching system 100 first. Regarding this, the external network control unit 53-corresponding to the line X3 of the existing network 7-
1 and 53-2 are configured to handle outgoing calls to an external network having network identification information different from that of the network 7, and as far as the outgoing call via this line X3 is concerned, the switching system 1
The operation is performed as if a network having temporary network identification information of 00 is connected. The point is that the existing network 7 has no function of converting the network identification information. FIG. 19 shows that a terminal S15 on the calling side is connected to the external network 6, and a terminal S25 on the called side is connected to the switching system 100. The route (h) originating the call from the terminal S15 and reaching the terminal S25 is formed by ordinary call connection control by the external network control unit 5, the same network control unit 3-1 and the like.

FIG. 20 shows a called terminal that has been connected to the existing network 7 to the end, including a terminal 26 that receives a call from the terminal 16 connected to the external network 6 in the existing network 7. Are all transferred to the switching system 100. Then, when the transfer of all the terminals is completed, the line X3 is removed, and the replacement is completed as shown in FIG.

Thus, by performing the transfer in the order shown in FIG. 14 to FIG. 21, the terminals are not transferred to the new network at one time, and are sequentially replaced without changing the identification information of the new network. Replacement can be performed step by step. In this embodiment, as shown in FIG. 1, the control unit 4 for the external network, the control unit 5 for the existing network,
Are collected in one exchange, but it is sufficient if these are provided as a whole network. Therefore, in another embodiment, the exchanges corresponding to the respective lines and terminals are provided in the same network corresponding unit 3-1.
The external network control unit 4 and the existing network control unit 5 are installed.
A configuration in which these are connected by a network line is adopted.

In the present embodiment, the packet network is used as an example, but the present invention can be applied to a circuit switching network. In this case, an exchange that performs circuit switching is adopted as an exchange constituting the network. Further, the present invention is applicable to a packet network in which a route is selected in the network for each packet, and a packet network in which a route is selected in the network for each call. Further, in the present embodiment, the existing network at the present time is targeted. However, when the network of the switching system becomes an existing network, it can be replaced by the switching system of the present embodiment. In such a case, since the existing network has the function of converting the network identification information, it is not necessary to transfer a terminal that makes a call to another network (including a new network) to the new network first. In other words, it is possible to gradually shift the terminals, repeat the test, and take the time to shift, and furthermore, it is possible to make the subscriber feel no burden on the address.

[0035]

As described above, according to the present invention, the call setting information sent from the terminal connected to the switching system or sent from the second network is a call connection request for the system. In such a case, a call connection is attempted in the system, and when the call connection is not established due to the absence of the destination terminal, the call setting information is transmitted as call setting information to the first network side. Call connection is attempted on the other network, and the call connection is made regardless of whether the called terminal is connected to the switching system or the existing first network, and gradual replacement is possible. And
In this case, there is no need to change the destination address of the call control information, and the subscriber is not bothered.

According to the second aspect of the present invention, a call connection is attempted in the system, and if the call connection is not established due to the absence of the destination terminal, the first network is added to the destination network identification information of the call setting information. The temporary network identification information is set and transmitted, and is further captured and transmitted to the first network after being converted to the true network identification information. Therefore, the call connection to the terminal corresponding to the destination is also attempted in the first network. In other words, since the call connection is made regardless of whether the called terminal is connected to the switching system or the existing first network, the called terminal can be transferred at any time, and the step-by-step replacement can be performed. Make it possible. In this case, there is no need for the subscriber to change the destination address of the call control information, and the subscriber is not bothered.

According to the third aspect of the present invention, the second aspect
In addition to the above invention, the temporary network identification information of the system set in the destination network identification information of the call setting information sent from the first network is changed to the intrinsic network identification information of the system, and the call setting information of the system is changed. Since the network identification information of the first network set in the source network identification information is changed to temporary network identification information and taken into the system, the first network is configured similarly to the system. , Whether the calling terminal and the calling terminal are in the first network or in the system,
A cross-search of the called terminal becomes possible between the system, the first network, and the second network, and an accurate call connection is made.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an exchange system according to an embodiment of the present invention.

FIG. 2 is a main part configuration diagram of an exchange system according to the embodiment of the present invention.

FIG. 3 is a main part configuration diagram of an exchange system according to an embodiment of the present invention.

FIG. 4 is a diagram showing a format of a call setting packet.

FIG. 5 is a diagram showing a detailed format of a main part of a call setting packet.

FIG. 6 is a flowchart for explaining the operation of the switching system according to the embodiment of the present invention.

FIG. 7 is a flowchart for explaining the operation of the switching system according to the embodiment of the present invention.

FIG. 8 is a flowchart for explaining the operation of the switching system according to the embodiment of the present invention.

FIG. 9 is a flowchart for explaining the operation of the switching system according to the embodiment of the present invention.

FIG. 10 is a flowchart for explaining the operation of the switching system according to the embodiment of the present invention.

FIG. 11 is a configuration diagram of an existing network substituted by the switching system according to the embodiment of the present invention.

FIG. 12 illustrates an operation of an existing network substituted by the switching system according to the embodiment of the present invention. Flow chart for.

FIG. 13 is a flowchart illustrating an operation of an existing network substituted by the switching system according to the embodiment of the present invention.

FIG. 14 is a view for explaining an operation of replacement by the switching system according to the embodiment of the present invention.

FIG. 15 is a view for explaining an operation of replacement by the switching system according to the embodiment of the present invention.

FIG. 16 is a diagram for explaining a replacement operation by the switching system according to the embodiment of the present invention.

FIG. 17 is a diagram for explaining an operation of replacement by the switching system according to the embodiment of the present invention.

FIG. 18 is a diagram for explaining a replacement operation by the switching system according to the embodiment of the present invention.

FIG. 19 is a diagram for explaining a replacement operation by the switching system according to the embodiment of the present invention.

FIG. 20 is a view for explaining an operation of replacement by the switching system according to the embodiment of the present invention.

FIG. 21 is a diagram for explaining a replacement operation performed by the switching system according to the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Exchange link control part 2 Exchange link 3-1-3-4 Correspondence control part in the same network 4 External network control part 5 Existing network control part 6 External network 7 Existing network 8-1-1
8-6 Terminal 9-1, 9-2 Network 100
Exchange system

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04L 12/56

Claims (3)

(57) [Claims] When a call connection information is sent from a terminal connected to a terminal and the call setting information sent from the terminal is a request for connection to the system, the call connection is attempted in the system, and the call connection is determined to be absent of the destination terminal. And a terminal corresponding means for transmitting the call setting information as call setting information to the first network side, and a call setting information connected to the second network and sent from the second network. Is a call connection request for the system, attempts a call connection in the system. If the call connection is not established due to the absence of the destination terminal, the call setting information is sent to the first network side. A second network-corresponding means for transmitting the call setting information of the second network, the terminal-corresponding means connected to the first network,
And a first network responding means for receiving a call setting information to the first network sent from the network responding means and requesting a call connection attempt in the first network. Exchange system. 2. When a call is connected to a terminal and the call setting information sent from the terminal is a call connection request for the system, a call connection is attempted in the system, and the call connection does not exist in the destination terminal. When the connection is not established, the terminal setting means sets the temporary network identification information of the first network in the destination network identification information of the call setting information and sends it out. If the call setting information sent from the network is a call connection request for the system, a call connection is attempted in the system, and if the call connection is not established due to the absence of the destination terminal, the call setting information A second network corresponding unit for setting temporary network identification information of the first network as destination network identification information of the first network and transmitting the second network corresponding to the first network;
The temporary network identification information of the first network set in the destination network identification information of the call setting information to the intrinsic network identification information of the first network in response to the call setting information sent from the network corresponding means And first network corresponding means for changing the network identification information of the system set in the source network identification information of the call setting information to temporary network identification information and transmitting the temporary network identification information to the first network. An exchange system, characterized in that: 3. When a call is connected to a terminal and the call setting information sent from the terminal is a call connection request for the system, a call connection is attempted in the system, and the call connection does not exist in the destination terminal. When the connection is not established, the terminal setting means sets the temporary network identification information of the first network in the destination network identification information of the call setting information and sends it out. If the call setting information sent from the network is a call connection request for the system, a call connection is attempted in the system, and if the call connection is not established due to the absence of the destination terminal, the call setting information A second network corresponding unit for setting temporary network identification information of the first network as destination network identification information of the first network and transmitting the second network corresponding to the first network;
The temporary network identification information of the first network set in the destination network identification information of the call setting information to the intrinsic network identification information of the first network in response to the call setting information sent from the network corresponding means At the same time, the network identification information of the system set in the source network identification information of the call setting information is changed to temporary network identification information and transmitted to the first network, and transmitted from the first network. The temporary network identification information of the system set in the destination network identification information of the call setting information is changed to the true network identification information of the system, and the second network information set in the source network identification information of the call setting information is changed. A first network corresponding means for changing the network identification information of one network into temporary network identification information and taking it into the system.