CN1251471C - Method of subscriber short number transfer in centralized business exchangers between switching offices - Google Patents

Abstract

The present invention provides a method for transmitting a short number of a centralized service exchange. When the outgoing call of the originating switching office determines that the call has inter-office CENTREX short number information, the method includes the following steps: A. Shorting the inter-office CENTREX The indication information of number and whether it is an inter-relay call is respectively placed in the address signal field and the number modifier indicator field of the general number parameter, and the general number parameter and the closed user group association code parameter used to represent the user group number are added Into the IAM message to be sent, and encapsulate it according to the inter-office standard transmission format; B. Send the IAM message encapsulated in step A to the outgoing signaling transmission interface; C. The incoming call of the receiving end switching office receives the After the IAM message, initiate a call setup request to the called user terminal, and display the calling number information to the called user terminal. The application of the present invention can realize the processing of inter-office CENTREX short number transmission without affecting the realization of other functions currently existing in the BICC protocol.

Description

A method for transferring short numbers of centralized service switches between relay offices

technical field

The invention relates to the centralized service switch technology, in particular to a short number transmission method of the centralized service switch in a centralized service switch group between relay offices.

Background technique

Bearer Independent Call Control (BICC: Bearer Independent Call Control) is a transmission system that separates signaling streams from media streams. The message of the BICC protocol can carry parameters including the number of the called party, the number of the calling party, the general number, the number to be redirected, and the number to be redirected to. The effective types that can be identified by the calling party number are mainly: subscriber number, domestic number, international number. The service of displaying the calling party number by the called party is mainly determined according to the attributes of the calling party number. The numbers that can be displayed are mainly There are several types of user numbers, domestic numbers, and international numbers. The calling number display service generally displays the actual calling party number as parameter information.

Centralized service exchange (CENTREX) group is a concept of virtual switch. A CENTREX group logically divides users, such as a school or an enterprise, into groups, but users in the same CENTREX group are not necessarily in the same relay office. For the CENTREX service, when calling between users in the local office, the calling party can only dial the called short number defined in the group, and when the called user displays the number of the calling user, only the short number defined in the group is displayed. The number display function is valid within the office. If the called CENTREX group user is an inter-office user rather than an intra-office user, since there is no CENTREX short number parameter in the BICC message, the called party cannot display the calling CENTREX short number.

Contents of the invention

In view of this, the present invention provides a method for transferring the short number of the centralized service switch in the centralized service switch group between the relay offices, and solves the problem of calling between users of the CENTREX group between the relay offices without affecting the existing functions of the BICC protocol. , the called party cannot display the CENTREX short number of the calling party.

For achieving the above object, technical scheme of the present invention is achieved in that way:

A method for transmitting a short number of a centralized service switch in a centralized service switch group between relay offices. When a call is established between an incoming and outgoing call, the calling call establishment request containing the calling number information is transmitted through the initial address message through the outgoing signaling interface. Sent to the called user end, when the outbound call of the originating switching office judges that there is short number information of the centralized service switch between relay offices in the call, the method further includes the following steps: A, placing the centralized service switch between relay offices The indication information of the short number and whether it is a call between relay offices is respectively placed in the address signal field and the number modifier indicator field of the general number parameter, and the general number parameter and the closed user group association code parameter used to represent the user group number Add it to the initial address message to be sent, and encapsulate it according to the inter-office standard transmission format; B. Send the initial address message encapsulated in step A to the outgoing signaling transmission interface; C. Steps for receiving the incoming call of the receiving exchange After sending the initial address message, B initiates a call establishment request to the called user terminal, and displays the calling number information to the called user terminal.

Wherein, the process of judging the existence of the short number information of the inter-office centralized service switch for the outgoing call is: after the outgoing call receives the call establishment request initiated by the calling user terminal, judge whether there is an inter-office centralized service switch in the call according to the application interface information. Service exchange group short number information.

Wherein, the step C further includes: C1, after the incoming call receives the initial address message of the opposite party, judge whether there is a universal number parameter in the initial address message, if it is to execute step C2, otherwise execute step C4; C2, judge the universal number Whether there is the short number transmission information of the centralized service exchange between relay offices in the parameter, if it is to perform step C3, otherwise perform step C4; C3, will contain the general number parameter and the short number information of the centralized service exchange between relay offices that need to be transmitted The closed user group association code parameters are encapsulated according to the specified standard message format; C4, the incoming call sends a call establishment request to the called user end, and after completing the bearer control information exchange, realizes an internal connection with the called user end, and returns the full address message at the same time To the originating exchange, display the calling number information to the called user terminal.

Wherein, the calling number information is a short number, a group number, or a complete calling number, or any combination of the three.

By applying the present invention, it is only necessary to define the spare field of the number modifier indicator in the general number parameter to indicate whether the transmission is an inter-office CENTREX short number, and use the address signal field in the general number parameter to store the short number of the centralized service exchange to be transmitted . At the same time, the group numbers of different CENTREX groups are represented by the closed user group association code parameters, which can be realized without adding any hardware facilities. The method is simple in application, good in operability and cost-saving.

Description of drawings

Fig. 1 is a format diagram of a general number parameter field;

Fig. 2 is the processing flowchart of the outgoing call example;

Figure 3 is a flow chart of the processing of an incoming call instance.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings and examples.

In the BICC protocol, the format of the general number parameter field in the transmission message is shown in Figure 1, and the allocation and value range of each field are known technologies. For the number modifier indicator field, its specific encoding values are as follows: 00000000 is the spare position reserved for the dialed number, 00000001 to 00001001 are the reserved positions for the additional spare number and the additional redirection number, 00001010 to 01111111 are spares without any definition, 10000000 to 11111101 are reserved for domestic applications, 11111110 has been defined and used, and 11111111 is reserved for expansion. It can be seen from this that the value defined in this field is Many alternate values are left. The present invention just utilizes the spare value reserved in the number modifier indicator field to define the CENTREX short number parameter between relay offices. In this embodiment, 10000000 of this field is defined as the number parameter of the CENTREX short number between relay offices, that is, when the value of the number modifier indicator in the parameter carried by the general number is 10000000, it means that the call is a relay office inter-office call, otherwise it is an intra-office call. For the CENTREX short number to be transmitted, it is stored in the address signal in the general number. At the same time, the group numbers of different CENTREX groups are represented by the closed user group association code parameter.

The basic process of the call instance of the BICC protocol is: the originating switching office sends an initial address message (IAM), which includes routing information to the destination and all information needed to connect the call to the called user; the receiving switching office receives After receiving the IAM message, analyze the number of the called user to determine which user to connect to. After completing the bearer control information interaction, check the situation of the called user line and verify whether the connection is allowed. If the connection is allowed, the terminal switching office Send a call setup message to the called user, this message includes all the messages sent by the originating end, and return the full address message (ACM) to the originating exchange at the same time; then control the establishment of a communication channel between the receiving and sending ends, and the called user picks up the phone to answer , the receiving end sends an answer message (ANM), and after the switching office of the originating end receives the ANM message, a call process is completed. The transfer of bearer control information between the receiving end and the sending end is mainly completed by the application delivery message (APM) interaction.

For the application of the BICC protocol, the realization process of the called party displaying the CENTREX short number between the relay offices is as follows:

As shown in Figure 2, the processing flow chart of the outgoing call instance:

Steps 201-202, when the BICC outgoing call instance receives the call establishment request sent by the calling user from the switching application interface; judge whether there is inter-office CENTREX group short number information in the call according to the application interface information, and if so, execute Step 203, otherwise directly execute step 204;

Step 203, adding the general number parameter and the closed user group association code parameter containing the CENTREX short number information between relay offices into the initial address (IAM) message to be sent, and encapsulating by the inter-office standard transmission format;

Step 204, sending an initial address (IAM) message to the outgoing signaling transmission interface of the BICC.

The processing flowchart of the incoming call instance as shown in Figure 3:

Steps 301-302, after the BICC incoming call instance receives the IAM message of the opposite office, judge whether there is a general number parameter in the IAM, if yes, then perform step 303, otherwise directly perform step 305;

Step 303, judging whether the modifier indicator field is indicated as the CENTREX short number information parameter between relay offices, that is, whether the value of this field is equal to 10000000, if yes, then execute step 304, otherwise directly execute step 305;

Step 304, encapsulating the general number parameter and the closed user group association code parameter containing the CENTREX short number information between the relay offices to be transmitted according to the specified standard transmission format;

Step 305, sending a call establishment request, realizing an internal connection with the called user, and sending back an ACM to the originating switching office at the same time.

So far, the CENTREX short number not in the same relay office can notify the called user.

According to the display mode of the calling number reserved by the called user, the called user can display the CENTREX short number, group number or complete calling number and any combination of these three numbers.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (4)

1, the method that centralized traffic switch cornet transmits in the centralized traffic exchange group between a kind of tandem office, when going out between the Incoming to set up when calling out, the calling request of setting up that comprises dialing number information sends to called party terminal by initial address message via going out office signaling transmission interface, it is characterized in that, judge when having between tandem office centralized traffic switch cornet information in the described calling at the outbound call of the exchange of making a start, this method further may further comprise the steps:

A, with centralized traffic switch cornet between tandem office and whether be address signal field and the number modifier deictic word field that the indication information of relaying station to station call is positioned over the universal number parameter respectively, this universal number parameter is joined the initial address message that is ready for sending with the related code parameters of closed user group that is used for representing customer group number, and press the encapsulation of interoffice standard transmission formats;

B, the initial address message that steps A is packaged are sent to out office signaling and transmit interface;

After the incoming call of C, receiving end exchange receives the initial address message that step B sends,, and dialing number information is shown to called party terminal to the called party terminal request of setting up that makes a call.

2, the method that transmits according to the described cornet of claim 1, it is characterized in that, described outbound call judgement exists the process of centralized traffic switch cornet information between tandem office to be: outbound call judges whether there is interoffice centralized traffic exchange group cornet information in this calling according to application interface information after receiving the setup requests of main dialing user initiation.

3, cornet transfer approach according to claim 1 is characterized in that described step C further comprises:

After C1, incoming call receive the initial address message of playing a game, judge whether there is the universal number parameter in the initial address message, if execution in step C2, otherwise execution in step C4;

C2, judge that whether having between tandem office centralized traffic switch cornet in the universal number parameter transmits information, if execution in step C3, otherwise execution in step C4;

C3, the universal number parameter that will contain centralized traffic switch cornet information between the tandem office that needs transmit and the related code parameters of closed user group are by the standard message format encapsulation of appointment;

C4, incoming call send setup requests to called party terminal, finish bear control information mutual after, realize inner the connection with called party terminal, the full message of loopback address is shown to called party terminal to making a start exchange with dialing number information simultaneously.

4, cornet transfer approach according to claim 3 is characterized in that: described dialing number information is centralized traffic switch cornet or group number or complete calling number or the combination in any between the three between tandem office.

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