JP3211889B2 - Control method of additional device inserted into communication line, exchange thereof, and recording medium recording program thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for controlling switching of a plurality of operating states in an additional device in which an exchange using a common channel signaling system is inserted into a communication line, and the exchange and a recording medium on which the program is recorded. In particular, regarding the erroneous capture of the communication line during the continuity test, or the extension of the call setting time when the IAM message (address signal) is transmitted due to the completion of the setting of the additional device, the necessity of the IAM message storage area, or the communication line The present invention relates to a control method capable of avoiding a double connection and the like, an exchange thereof, and a recording medium storing the program.

[0002]

2. Description of the Related Art Conventionally, in a digital electronic exchange system of a common channel signaling system using this type of control method, as shown in FIG. 4, an electronic exchange 10 is connected to a transmission line 20 connecting to a destination exchange. First, a control signal is transmitted / received via one common signal line 22 to a plurality of communication lines 21, and a communication line used for communication is set based on the control signal. As such a common channel signal system, for example, No. 1 defined in ITU-T. There are seven signaling systems.

Further, an additional device 30 capable of performing a plurality of types of operations is inserted into the communication line 21 in order to support various types of functions. For example, DCME
(Digital Circuit Multipli
site Equipment). DCME
Is a device for reducing necessary bandwidth by compressing / decompressing data flowing through a communication line by utilizing characteristics of a voice signal. The additional device 30 described below has a DCME function.

[0004] The additional device 30 which is a DCME has two states. One is a normal state in which data is compressed / decompressed, and the other is a transparent state in which data set by a request is passed without changing. Specifically, when a call that expects a bit code to be transmitted transparently, for example, a 64 kbps unrestricted call flows through a communication line in which the additional device 30 is inserted, the electronic exchange 10 releases the data compression to the additional device 30. Is requested in advance, and the actual communication is started after the transition to the data decompression state is completed.

As described above, when an additional device is inserted into a communication line, the communication line cannot be used until the additional device is in a state suitable for communication. Therefore, the state of the additional device is managed inside the switching system. There is a need to.

In the case of DCME, ITU-T Recommendation Q. According to the definition based on 50, one of two types, “perform continuity test” or “do not send IAM message until DCME setting is completed” will be adopted.

Next, a case where a continuity test is performed will be described with reference to FIG.

FIG. 5 shows a configuration for forming a communication path from a transmitting station A to a receiving station D via relay stations B and C.
As shown in the figure, in the relay station B, an additional device E which is DCME is inserted.

The relay station B, which has received the IAM message as the address signal from the transmitting station A via the common signal line, performs predetermined IAM message processing including selection setting of a communication line for the receiving side, ie, the subsequent relay station C. Is performed for a processing time Di, and then the IAM message is sent to the terminating station D via the succeeding relay station C, and a request is made to the additional device E inserted into the communication line selected and set with the relay station C. And set data decompression. On the other hand, the relay station B is
Since the continuity test sound is received via the communication line set by the transmitting station A between the transmitting station A, the continuity test sound is returned to the transmitting station A via this communication line.

When receiving a continuity test tone from the transmitting station A, the relay station B sends out a continuity test tone to the relay station C via the communication line set up, and the continuity test tone is sent from the relay station C. Check the continuity of the communication line after receiving the sound. In the relay station C, when receiving the continuity test tone from the preceding relay station B, the continuity test tone is sent to the subsequent destination station D and the relay station B
Return to The continuity test sound between the relay stations B and C passes through the additional device E inserted in the communication line. However, it is necessary that the additional device E cancels data compression by the normal passage of the continuity test sound. Can be determined.

The transmitting station A, which has received the continuity test sound, transmits a COT message, which is a continuity test good signal, to the subsequent relay station B via the common signal line. B is COT via a common signal line
The message is transmitted from the subsequent relay station C to the destination station D.
Upon receiving the COT message from the preceding relay station C, the receiving station D returns the ACM message, which is the address completion signal, to the relay station B and the transmitting station A via the preceding relay station C. A calling terminal is called, and a ringing tone (RBT) is transmitted to the calling side via a communication line.

Next, a case where "the IAM message is not transmitted until the setting of DCME is completed" will be described with reference to FIG. In this case, it is assumed that the IAM message (E) of “no continuity test” is used. Also in this case, as described above, the additional device E is inserted into the communication line between the relay station B and the relay station C.

A relay station B receiving an IAM message (E) as an address signal from a transmitting station A via a common signal line
Performs predetermined IAM message processing including selection of a communication line for the relay station C, and then sends and drives the REQ signal requesting the additional device E to set a state based on the IAM message (E). The additional device E receives the REQ
ACK of setting completion after completion of state setting based on signal
The signal is returned to the relay station B.

The relay station B, which has received the ACK signal from the additional device E, sends an IAM message (E) to the destination station D via the subsequent relay station C. The receiving station D is IA from the preceding relay station C.
Upon receiving the M message (E), the ACM message, which is an address completion signal, is returned to the relay station B and the calling station A via the preceding relay station C, and then the called terminal is called and the calling terminal is called. On the other hand, a ringing tone (R
BT).

Next, referring to FIG. 7 and FIGS. 4 and 6, an operation procedure up to the start of calling by the electronic exchange 10 of each station will be described.

The electronic exchange 10 in each station receives the IAM message (E) from the preceding station via the common signal line 22 (step S101), and when the IAM message (E) is an incoming call (YES in step S102). The electronic exchange 10 of the called station performs predetermined incoming call reception processing (step S103), and sends an ACM message to the preceding station (step S104).
And call the called terminal. Therefore, the electronic exchange 10 of the receiving station sends a ringing tone (RBT) to the calling side via the communication line.

On the other hand, if the above step S102 is "NO" and the call is not an incoming call, the electronic exchange 10
IAM processing such as selecting and setting the communication line 21 for the downstream station based on the M message (E) (procedure S110)
Perform Next, the electronic exchange 10 inserts the additional device E inserted through the communication line selected and set in step S110.
Is checked, and the additional device is inserted (Y in step S111).
ES), a setting request is sent to the additional device E (step S11).
Send the REQ signal of 2). Next, the electronic exchange 10
Upon receiving the ACK signal indicating that the setting is completed (procedure S113) from the additional device E, the IAM message (E) is transmitted to the subsequent device (procedure S114) and waits for the reception of the ACM message from the subsequent device (NO in procedure 115). ).

If this step S115 is "YES" and an ACM message is received from the back, the electronic exchange 10
Transfers the received ACM message to the previous position (procedure S116)
And end the procedure. Thereafter, the electronic exchange 10 knows that it has entered a call state by transferring the ANM message of the response signal received from the subsequent device to the preceding device.

If there is no additional device inserted into the communication line for which the above procedure S111 is set to "NO", the electronic exchange 10 transfers the IAM message to the subsequent station based on the IAM message received from the preceding station ( In step S119), the process proceeds to step S115 to wait for an ACM message from the subsequent device.

[0020]

The above-described conventional method for controlling an additional device inserted into a communication line and a switch using the control method have the following problems.

The first problem is that, when performing a continuity test, there is a possibility that the line is erroneously recognized even though the line has not been reliably captured.

The reason is that DCME, which is an additional device, normally compresses and transmits data on a communication line as a default operation, but receives a request for a state change when data compression needs to be decompressed. Also, the continuity test may be successful before the bit code is in a state of transparent transfer, in which case it is erroneously recognized as a normal state.

The second problem is that when "the IAM message is not transmitted until the DCME setting is completed", the time required for call setting becomes long.

The reason is that the set time De from the request to the completion of data compression of DCME to the completion thereof is long. For example, in the case of passing through a satellite line, the electronic exchange requests the data decompression and after several hundred milliseconds, This is because the completion of the setting cannot be received unless it is afterwards, and is added to the call setting time as it is by the setting time De as compared with the case where DCME is not used.

A third problem is that when "the IAM message is not transmitted until the DCME setting is completed", the transit exchange requires a larger storage capacity for the IAM message.

The reason for this is that, similarly to the reason for the second problem described above, when DCME is used in a transit exchange, it takes a long time to confirm the state setting.
This is because the storage time is required for the set time De compared to the case where the ME is not used.

A fourth problem is that when "the IAM message is not transmitted until the setting of DCME is completed", the probability of double capture of the communication line increases.

The reason is that the relay exchange using DCME selects and sets the communication line to be used before transmitting the communication line information by the IAM message to the downstream station facing the receiving side, and specifies and specifies the selected and set communication line. This is because the DCME inserted in the communication line is controlled, and during this control, there is a high possibility that an opposing downstream station will select the set communication line.

An object of the present invention is to solve the above-mentioned problems and, when an additional device is used, to extend the call setup time in the exchange, increase the required memory amount, and avoid double capture of the communication line. It is an object of the present invention to provide a method of controlling an additional device to be inserted into a communication line, and an exchange using the control method.

[0030]

A control method for an additional device according to the present invention is a control method for an additional device in which an exchange using a common channel signaling system switches and controls a plurality of operating states of the additional device inserted into a communication line. When an IAM message (address signal) is received from the transmitting station, a predetermined IA
When the M message acceptance process is completed and the communication line in which the above-mentioned additional device is inserted is selected, an IAM message in which a predetermined "this line has a continuity test" indicating the execution of the additional device control is created on the receiving station side. After requesting the additional device for a state setting based on the IAM message and obtaining the setting confirmation, a predetermined COT message (continuity test good signal) is transmitted to the receiving station side to send the AC
It is characterized by waiting for reception of an M message (address completion signal).

An exchange for controlling the switching of the operation state of the additional device is a switch which uses a common channel signaling system and switches and controls a plurality of operation states of the additional device inserted into the communication line. After receiving the IAM message and completing the predetermined IAM message receiving process, when the communication line into which the additional device is inserted is selected, a predetermined IA indicating the execution of the additional device control to the receiving station side.
M message is created and transmitted, and at the same time, a status setting based on the IAM message is requested to the additional device, and after confirming the setting, a predetermined COT message is transmitted to the receiving station side to send an ACM message (address completion signal). )
It is characterized by having a control means for waiting for the reception of.
Therefore, this exchange is provided with a recording medium on which the above-described control program is recorded.

With this configuration, the exchange receiving the IAM message suspends the call processing until receiving the COT message, and after receiving the COT message, uses the communication line to resume the call processing and proceed to the calling procedure. This is after the state setting of the additional device is completed. Therefore, the state of the additional device for communication, that is, the state of the communication line can guarantee the communication.

Further, since the IAM message can be sent to the downstream without waiting for the completion of the setting of the additional device, there is no need to increase the storage capacity of the IAM message. Further, the procedure after the completion of the setting of the additional device is not a process based on the IAM message but a C
Since the processing is based on the OT message, the time required for call setting can be reduced.

[0034]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sequence chart from calling to answering in a call setting procedure according to an embodiment of the present invention. In FIG. 1, as in FIG.
A case where “the IAM message is not transmitted until the DCME setting is completed” will be described. In this case, an IAM message (E) without a test using a continuity test sound is used. Further, there is shown a configuration in which a communication path is formed from the transmitting station A to the receiving station D via the relay stations B and C,
As shown in the figure, in the relay station B, an additional device E which is DCME is inserted.

In the illustrated example, the relay station B has the originating station A
Receives an IAM message (E), which is an address signal, via a common signal line from the terminal, after performing a predetermined IAM message processing including a communication line selection setting for a subsequent relay station C on the receiving side. , An IAM message (A) in which the parameter value of “continuity test indication” included in the IAM message is set to “there is a continuity test on this line” is sent to the subsequent relay station C, and the IAM message is sent to the additional device E.
The REQ signal for requesting the state setting based on the message (E) is sent and driven. After completing the state setting based on the received REQ signal, the additional device E returns an ACK signal indicating the completion of the setting to the relay station B.

Upon receiving the ACK signal from the additional device E, the relay station B creates a COT message, which is a continuity test good signal, and sends it via the common signal line to the destination station D via the relay station C on the downstream side.
Send a COT message to Upon receiving the COT message from the preceding relay station C, the receiving station D
After performing the OT message processing, an ACM message, which is an address completion signal, is returned to the relay station B and the originating station A via the preceding relay station C, and the called terminal is called and the communication line is sent to the calling side. A ringing tone (RBT) is sent out via the terminal.

On the other hand, the relay station (C) that has received the IAM message (A) performs predetermined IAM message processing including selection setting of a communication line with respect to the subsequent terminating station D.
IAM with "continuity tested on this line" set as the parameter value of "continuity test display" included in the IAM message
A message (B) is created and sent to the subsequent terminating station D to wait for the arrival of the COT message from the preceding station.

After receiving the IAM message (B) and receiving the COT message, the receiving station D performs predetermined COT message processing, and then creates an ACM message as an address completion signal. Next, the receiving station D returns the ACM message to the relay station B and the transmitting station A via the preceding relay station C via the common signal line, and then calls the called terminal, and simultaneously transmits the communication line to the calling side. A ringing tone (RBT) is sent out via.

Next, an operation procedure from the reception of an IAM message by the electronic exchange 10 of each station to the start of a call will be described with reference to FIGS.

The electronic exchange 10 in each station receives an IAM message from the preceding station via a common signal line (step S1), and the received message is an IAM message (E).
In the case of (2) (YES in step S2) and in the case of an incoming call (YES in step S3), a predetermined incoming call reception process is performed as the electronic exchange 10 of the receiving station D (step S4), as in the conventional FIG. And sends an ACM message to the preceding transmitting station A (step S105) and calls the called terminal. Therefore,
The electronic exchange 10 of the receiving station D sends a ringing tone (RBT) to the calling side via the communication line.

If the above step S3 is "NO" and the call is not an incoming call, the electronic exchange 10 performs an IAM process such as selecting and setting the communication line 21 for the downstream station based on the IAM message (E) (step S10). Perform Next, the electronic exchange 10 checks the presence or absence of the additional device E in the communication line 21 selected and set in step S10. If the additional device E is inserted (YES in step S11), the parameter of the “continuity test display” is immediately set. An IAM message (A) in which the value is set to “there is a continuity test on this line” is created and transmitted to the downstream station via the common signal line 22 (step S12). Next, the electronic exchange 10 makes a setting request to the additional device E (procedure S
The REQ signal of step 13) is sent, and the ACK signal of the setting completion (step S14) is received from the additional device E, so that a COT message, which is a continuity test good signal, is created and transmitted to the subsequent device (step S15), and the ACM message Is received from the posterior device (step 16).

If this step S16 is "YES", the electronic exchange 10 receives the ACM message from the subsequent receiving station.
Transmits the ACM message to the preceding calling station (procedure S
17) Then, the procedure ends. Thereafter, the electronic exchange 10 transmits the response signal AN which is a response signal of the called terminal.
Since the M message is received from the posterior station, the start of the communication can be known by transferring this message to the posterior station.

When the above procedure S11 is "NO" and no additional device is inserted, the electronic exchange 10 sends the IAM message to the subsequent device via the common signal line based on the IAM message (E) received from the preceding device. Transfer (E) (procedure S19)
Then, the process proceeds to the step S16 of waiting for the ACM message from the subsequent device.

Next, when the message received in step S2 is "NO" is an IAM message (A or B),
In addition, as shown in FIG. 3, when the received message is an incoming call (YES in step S21), as shown in FIG. (Step S22), and waits until a COT message, which is a continuity test good signal, is received from the preceding device via the common signal line (Step S23).

If this step S23 is "YES" and the COT message is accepted, the electronic exchange 10 performs predetermined COT message processing, and then sends the ACM message of the address completion signal to the preceding signal via the common signal line. The call is transmitted to the calling side (step S24) and the called terminal is called.
Accordingly, the electronic exchange 10 of the called station D sends a ringing tone (RBT) to the calling side via the communication line.

On the other hand, if the above step S21 is "NO" and the call is not an incoming call, the electronic exchange 10 transmits the communication line 21 to the downstream station based on the IAM message (A or B).
IAM message processing such as selecting and setting (step S3
Perform 0). Next, the electronic exchange 10 proceeds to step S30.
The presence / absence of the additional device E in the communication line 21 selected and set in the above is checked, and the additional device E is inserted (YE in step S31).
In the case of S), an IAM message (A) in which "continuity test is performed on this line" is set as the parameter value of "continuity test display" immediately and transmitted to the downstream station via the common signal line 22 ( Step S32) is performed. Next, the electronic exchange 10
Sends a REQ signal of a setting request (procedure S33) to the additional device E, and sends an AC indicating completion of setting (procedure S34) from the additional device E
Receiving the K signal, it waits for the reception of the COT message from the preceding device (step S35).

If this step S35 is "YES", C
When the OT message is received, after the predetermined COT message processing, a COT message which is a continuity test good signal is created and transmitted to the subsequent device (procedure S36), and the ACM message is received from the subsequent device (procedure 37). Wait for.

If the result of this step S37 is "YES", the electronic exchange 10 receives the ACM message from the subsequent terminating station.
Transmits the ACM message to the preceding calling station (procedure S
38), the procedure ends.

When the above procedure S31 is "NO" and no additional device is inserted, the electronic exchange 10 displays "continuity test display" for any of the IAM messages (A or B) received from the preceding device. Create an IAM message (B) with the parameter value set to "test performed on previous line" and send it to the downstream station via common signal line 22 (step S39)
Then, the process proceeds to the above-described procedure S35 to wait for the reception of the COT message from the preceding stage.

In the above description, in the IAM message (A or B), the “continuity test display” is set to “with continuity test” or “test performed on the preceding line”. On the other hand, it is only necessary to select whether to wait for the COT message from the preceding place or the ACM message from the succeeding place. Therefore, it may be set in another position in the message by another expression.

In the above description, the additional device is DCME. However, another additional device may have two or more states. In such a case, naturally, the contents of the IAM message will differ depending on the respective meanings.
When the state needs to be changed, the adoption of the present invention is effective.

In the above description, for example, the RE
Although the transmission of the Q signal has been described after transmitting the IAM message to the subsequent position, it may be performed before the transmission of the IAM message.

[0054]

As described above, according to the present invention, the following effects can be obtained.

The first effect is that an increase in time required for call setup can be suppressed.

The reason is that, as shown in FIG. 1, the set time De required for setting the additional device, the processing time Di required for relaying the IAM message, the processing time Dc required for relaying the COT message, and "n" Assuming that the switching is performed via the relay station and the destination station, the switching from the reception of the IAM message by the exchange of the relay station B equipped with the additional device E until the switching of the destination station D can return the ACM message is started. The required time is as follows.

Conventional method (see FIG. 6) De + Di * n Method of the present invention (see FIG. 1) De + Dc * (n−1) + Di Difference between conventional and present invention (Di−Dc) * (n−1) Since the IAM message processing time Di is shorter than the COT message processing time Dc, and the number of exchanges is greater than "2", the present invention can greatly reduce the required time in the related art and increase the processing capacity.

The second effect is that the accumulation of IAM messages in the relay exchange becomes unnecessary except for processing IAM messages.

The reason is that at the time when the IAM message processing is completed and the communication line is set up and the IAM message can be transmitted to the downstream, the IAM message can be sent without waiting for the completion of the setting of the additional device.
This is because an AM message can be transmitted.

The third effect is that it is possible to avoid deterioration of the probability of double capture of the communication line.

The reason is that when a communication line is set up, an IAM message can be sent to the opposite station for notification.

[Brief description of the drawings]

FIG. 1 is a sequence chart showing an embodiment of the present invention.

FIG. 2 is a flowchart showing one embodiment of the operation procedure in the exchange of each station in FIG. 1 in the case of “no relay” of a relay station equipped with an additional device.

FIG. 3 is a flowchart showing one embodiment of the operation procedure in the exchange of each station in FIG. 1 in a case where a relay station equipped with an additional device has “relay”.

FIG. 4 is a connection diagram showing an example in which an electronic exchange is connected to a transmission line.

FIG. 5 is a sequence chart showing an example of a conventional "conductivity test" case.

FIG. 6 shows a conventional IAM until the setting of DCME is completed.
It is a sequence chart which shows an example when "a message is not sent".

FIG. 7 is a flowchart illustrating an example of an operation procedure of an exchange in each station in FIG. 6;

[Explanation of symbols]

 A Calling station B, C Relay station D Receiving station E, 30 Additional equipment (DCME) 10 Electronic exchange 21 Communication line 22 Common signal line

Claims (10)

(57) [Claims] 1. A method of controlling an additional device, in which an exchange using a common channel signaling system switches and controls a plurality of operating states of an additional device inserted into a communication line, wherein a relay station sends an IAM message (address signal )
First, when a predetermined IAM message acceptance process is completed, and a communication line in which the additional device is inserted is selected, a predetermined IAM message indicating execution of the additional device control is created and transmitted to the receiving station side, and is also sent to the additional device. On the other hand, I
After requesting the status setting based on the AM message and obtaining this setting confirmation, a predetermined COT message (continuity test good signal) is sent to the receiving station side to wait for the reception of the ACM message (address completion signal). Control method of the additional device. 2. The method according to claim 1, wherein the predetermined IAM message indicating the execution of the control of the additional device has “continuity test on this line” set as a value of a “continuity test display” parameter. Control method of additional device. 3. The IA according to claim 1, wherein a station behind the relay station performs a predetermined IA indicating execution of the additional device control.
When the M message is received, if the call is an incoming call, it waits for the arrival of the next received COT message. If the call is a relay call, after processing a predetermined IAM message, an IAM message indicating that a continuity test has been performed A method of controlling an additional device, comprising: preparing a COT message to be transmitted to a receiving side and waiting for a COT message to be received next. 4. The method according to claim 3, wherein when the predetermined IAM message indicating that the continuity test has been performed is received, if the call is an incoming call, the arrival of a COT message to be received next is waited for, and the call is relayed. In the case of (1), after the predetermined IAM message processing, the IAM message indicating that the continuity test has been performed is transferred to the receiving side, and the arrival of the next COT message to be received is waited for. 5. An exchange which uses a common channel signaling system and switches and controls a plurality of operating states of an additional device inserted into a communication line, receives an IAM message (address signal) from a source station side, and receives a predetermined IAM message. After the receiving process, when the communication line into which the additional device is inserted is selected, a predetermined IAM message indicating execution of the additional device control is created and transmitted to the receiving station, and the IAM message is sent to the additional device. After requesting a state setting based on the message and obtaining this setting confirmation, a predetermined COT message (continuity test good signal) is sent to the receiving station side to send AC
An exchange comprising control means for waiting for reception of an M message (address completion signal). 6. The COT according to claim 5, wherein the control means receives a predetermined IAM message indicating execution of the additional device control from the exchange of the preceding station, and if the call is an incoming call, receives the next COT. Wait for the message to arrive, and if the call is a relay call, after processing a predetermined IAM message, create an IAM message indicating that the continuity test has been performed, send it to the called side, and wait for the next COT message to arrive. The exchange that features it. 7. The COT message according to claim 6, wherein the control means receives a predetermined IAM message indicating that the continuity test has been performed from the exchange of the preceding station, and if the call is an incoming call, receives the next COT message. And when the call is a relay call, after processing a predetermined IAM message, transfers the IAM message indicating that the continuity test has been performed to the receiving side, and waits for the arrival of the next COT message to be received. And exchange. 8. An IAM message (address signal) is transmitted from an originating station side to a recording medium in which an exchange using a common channel signaling system records a program for controlling switching of a plurality of operating states of an additional device inserted into a communication line. When received,
First, a predetermined IAM message acceptance process is completed, and when a communication line in which the additional device is inserted is selected, a predetermined IAM message indicating execution of the additional device control is created and transmitted to the receiving station side, and is also sent to the additional device. On the other hand, I
After requesting the status setting based on the AM message and obtaining this setting confirmation, a predetermined COT message (continuity test good signal) is sent to the receiving station side to wait for the reception of the ACM message (address completion signal). A recording medium on which a program to be recorded is recorded. 9. The method according to claim 8, wherein when a predetermined IAM message indicating execution of the control of the additional device is received from a preceding station, if the call is an incoming call, waiting for the next COT message to be received. If the call is a relay call, after processing a predetermined IAM message, I indicates that a continuity test has been performed.
Create an AM message, send it to the called party and then receive C
A recording medium recording a program characterized by waiting for the arrival of an OT message. 10. The method according to claim 9, wherein when the predetermined IAM message indicating that the continuity test has been performed is received from the preceding station, if the call is an incoming call, the arrival of the next COT message to be received is waited for. If the call is a relay call, after processing a predetermined IAM message, the IAM message indicating that the continuity test has been performed is transferred to the receiving side, and the next received CAM message is received.
A recording medium recording a program characterized by waiting for the arrival of an OT message.