KR100311643B1 - The enhanced method of V5.2 block process for Integrated Service Digital Network port - Google Patents

Abstract

The present invention relates to a method of changing a V5.2 integrated information network port block procedure to prevent an abnormally transitioning ISDN call when performing a V5.2 integrated information network port block, and an ISDN status inquiry procedure in a V5.2 ISDN port block procedure. And ISDN call release procedure to prevent ISDN calls that transition to an abnormal state after the block procedure.

Description

5.2 enhanced information of V5.2 block process for Integrated Service Digital Network port

The present invention relates to a method for changing a V5.2 integrated information network port block procedure, and more particularly, to an integrated service digital network (V5.2) protocol in an all-electronic exchange in a call processing field of an exchange technology. It refers to a method of changing the procedure of the port block.

Conventional local exchange (LE) and subscriber access equipment (AN) are connected via a mutual V5.2 interface, as shown in Figure 1 port control signal (PORT CTRL (FE203)) in the local exchange (LE) When sending to the subscriber access equipment (AN) the subscriber access equipment (AN) sends a port control response signal (PORT CTRL ACK (FE203)) to the local exchange (LE).

In the conventional port block procedure, since there is no specific reference to ISDN call truncation, at the moment when the port block proceeds, the data link of the corresponding port is disconnected, but at the upper level, an abnormal connection is established. Even if you have a procedure or if the port is transitioned to an unblocked state again, the data link reset procedure of Layer 2 of the port is performed. There is a problem that the ISDN call of layer 3) transitions to an unrecovered state.

In other words, blocking an ISDN port on a V5.2 protocol results in an abnormal state in which the call is not recovered according to the call state of the port. In the case of the PSTN port, the PSTN call processing software module uses the PSTN protocol entity. Although a procedure for disconnecting all calls after receiving DISCONNECT COMPLETE transmitted from the PSTN Protocol Entity is recommended, this problem occurs because there is no specific recommendation for ISDN calls.

Accordingly, the present invention has been made in view of the above-described conventional circumstances, and an object of the present invention is to provide a method for changing a V5.2 integrated information network port block procedure to prevent an ISDN call from abnormally transitioning when performing a V5.2 integrated information network port block. have.

In order to achieve the above object, the method of changing a V5.2 integrated information network port block procedure according to the preferred embodiment of the present invention is that the ISDN call processing software module disconnects a call from a control protocol entity when performing the V5.2 ISDN port block procedure. A first process of driving a first timer upon receiving a request; release of a call and bearer channel when a timeout of the first timer occurs, and a data link release indication signal from layer 2 before a timeout of the first timer If the state of the port is reconfirmed, if the state of the port is 'block', the release completion signal is transmitted to the subscriber access device and the call is terminated. If the state of the port is 'non-block', the port activation procedure is performed. A second process of operating a timer and then requesting the data link reset procedure to the layer 2; and confirming the data link setup from the layer 2 When an incoming signal is received, a status inquiry message is transmitted to the subscriber access equipment. When a status message is transmitted from the subscriber access equipment, the status of the subscriber access equipment and the state of the ISDN call processing software module are compared. If there is a mismatch, a third process of cutting the arc is provided.

1 is a view adopted to explain the procedural problems of the conventional V5.2 information network port block,

2 is a V5.2 integrated information network port block procedure to which the present invention is applied,

3 is a call information storage diagram of the integrated information communication network call processing software module according to an embodiment of the present invention.

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

2 is a V5.2 integrated information network port block procedure to which the present invention is applied.

When the local exchange LE sends a port control signal PORT CTRL FE203 to the subscriber access equipment AN, the port control response signal PORT CTRL ACK FE203 from the subscriber access equipment AN to the local exchange LE side. The ISDN call processing software module starts a timer T352 (approximately 10 seconds) upon receipt of the Call Disc RQ from the CONTROL PROTOCOL ENTITY.

When the timer T352 times out, the ISDN call processing software module sends a release complete signal to the subscriber access equipment (AN) to release the call and release the bearer channel. Let's do it.

If the ISDN call processing software module receives the data link release indication signal (DL Release Indication) from Layer 2 before the timeout of the timer T352 occurs, the state of the port is re-checked. As a result, if the port is a block, the call is terminated after the Release Complete signal is transmitted to the subscriber access equipment (AN). If the port is unblocked, the port activation procedure specified in the recommendation ( After performing PORT ACTIVATION PROCESS, the timer T309 is operated and a data link reset procedure is requested to the layer 2 (DL ESTABLISH RQ).

If the ISDN call processing software module receives the data link establishment confirmation message (DL ESTABLISH CONF) from the layer 2 before the timer T309 is timed out, the terminal (ie, subscriber access equipment) receives a status inquiry message (STATUS ENQUIRY). (AN)). Subsequently, when the ISDN call processing software module receives a status message from the terminal, the state of the subscriber access equipment (AN) is compared with the state of the ISDN call processing software module, and if the match is maintained, the subscriber is maintained. Send Release Complete signal to the connected equipment (AN) and disconnect the call.

Here, the call maintenance / call disconnection operation by the state comparison of the subscriber access equipment (AN) and the ISDN call processing software module according to the data link resetting procedure is possible only when the blocked port is unblocked again.

For example, if an ISDN call occurs between a call from a subscriber access equipment (AN) or a call from a network, as shown in FIG. 3, the ISDN call processing software module obtains an interface ID and a port number. Unlike general PSTN calls, ISDN calls are created with more than one child process, which starts the generated child process and stores the child process ID generated by the corresponding interface and port number. The stored child process ID is stored in a linked list structure.

In the above description of the present invention, when performing the V5.2 ISDN portblock procedure, the control protocol entity transmits an ISDN call teardown request to the ISDN call processing software module, and the ISDN call processing software module receiving the ISDN call timer generates a timer (T352). Drive it. If a DL Release Indication is received before the timeout occurs, check the port status. If the port status remains in the block state, send a Release Complete to the subscriber access equipment (AN). End the call. If it is transitioned back to the non-blocking state, the PORT ACTIVATION PROCESS is performed and then the data link reset procedure and the status inquiry procedure are performed. If both of these procedures succeed, the call remains intact, and if either of the two procedures fails, the ISDN call is disconnected by sending Release Complete to the subscriber access equipment (AN). If a timeout occurs before receiving the data link indication, the call is disconnected without performing the data link reset procedure and the STATUS ENQUIRY procedure.

The call cutting request from the control protocol entity to the ISDN call processing software module is when the FSM of the ISDN port transitions to 1.0. In order to process the call cutting request from the control protocol entity, the ISDN call processing software module is determined by interface and port number. Store / manage child processor IDs.

According to the present invention as described above, by preventing the ISDN call that is abnormally transitioned when performing the V5.2 ISDN port block, invalid possession of the bearer channel utilized as common resources (V5.2 PSTN, V5.2 ISDN) Prevent stabilization of V5.2 ISDN services and prevent unusual charges and statistics.

On the other hand, the present invention is not limited only to the above-described embodiments, but may be modified and modified without departing from the scope of the present invention.

Claims (4)

A first step of, when the ISDN call processing software module receives a call disconnect request from a control protocol entity when performing an ISDN portblock procedure; When the timeout of the first timer occurs, the call and bearer channels are released. If a data link release indication signal is transmitted from layer 2 before the timeout of the first timer, the port state is reconfirmed. In this case, after the release completion signal is transmitted to the subscriber access equipment, the call is terminated. If the state of the port is 'no block', the port activation procedure is performed, and then the second timer is operated. A second process requiring; When the data link establishment confirmation signal is received from the layer 2, a status inquiry message is transmitted to the subscriber access equipment. When the status message is transmitted from the subscriber access equipment, the state of the subscriber access equipment is compared with the state of the ISDN call processing software module. And a third step of maintaining the call if it matches and disconnecting the call if there is a mismatch. The method of claim 1, And the third step is performed only when the blocked port is again unblocked. The method of claim 1, And when the ISDN call occurs, the ISDN call processing software module stores a child processor ID generated for each interface and port number. The method of claim 4, wherein And the child processor ID is stored in a linked list structure.