WO2007059676A1

WO2007059676A1 - A method and a system for implementing trunk offering

Info

Publication number: WO2007059676A1
Application number: PCT/CN2006/002165
Authority: WO
Inventors: Yunhui Li
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2005-11-22
Filing date: 2006-08-24
Publication date: 2007-05-31
Also published as: CN1882021A; CN100542196C

Abstract

A method for implementing trunk offering, which is applied in NGN using Q931 protocol, the method includes: when a switch device receives a telephone call, and finds that the called terminal is busy, the switch device sends a TOF signal to a media gateway, the media gateway converts the TOF signal to a indication message of the operator, and the indication message of the operator is sent to the media gateway controller to control the call of the called terminal. The present invention also provides a system for implementing trunk offering, which includes: a switch device, for sending TOF signal to the media gateway; a media gateway, for conversion between the TOF signal and the indication message of the operator; a media gateway controller, for controlling the call according to the indication message of the operator. According to the invention, the question how to implement R2 signal standard through R2/PRA conversion access in NGN may be resolved, and the function of the trunk offering is implemented.

Description

TECHNICAL FIELD The present invention relates to communication technologies, and more particularly to a method and system for implementing long-distance attendant insertion in an NGN (Next Generation Network). Background technique

The NGN network is a network in which the service control and the bearer media are separated. The service control part can be implemented by the MGC (Media Gateway Controller), and the bearer part can be implemented by the MGW (Media Gateway). The H.248 protocol is generally used between the MGC and the MGW to implement bearer control.

Channel-dependent signaling is an inter-office signaling. Currently, the associated signaling is R2, R1, No5, and so on. Among them, R2 signaling is widely used in switching equipment models in many countries. R2 standards in various countries generally define long-distance attendant insertion signaling. In this way, when NGN system equipment enters different countries and markets to connect with various types of switching equipment, it must support It defines different signaling standards, such as operator insertion signaling.

ISDN (Integrated Services Digital Network) In the network, PRA (Primary Rate Access) indicates the base rate access, and ISDN users are connected to the network through E1 or T1. It is generally used to connect PBX (Private Switching Equipment) to an ISDN network, and its network layer can adopt the ITU-T Q.931 protocol.

TOF (long-distance attendant insertion) is a kind of call service control method widely used in early switching equipment systems. It generally refers to long-distance calls that are transferred by the attendant. When the called user is found to be talking, the attendant passes inter-office signaling (such as R2). Signaling) The special TOF signal is defined to notify the switching device to initiate the long-distance attendant insertion processing process, so that the called user can hear the long-distance insertion tone or the attendant enters the three-way call, and informs the called user to have a long-distance call; when the called user When hanging up, the operator can ring or automatically ring the called party through the TOF signal, and the called user picks up the phone and enters the call.

In the prior art, because the network layer protocol ITU-T Q.931 series defines a rich message and information unit interface for establishing, maintaining, and clearing a call process, it can be comprehensive. A program that supports basic call control and supports call control procedures related to the supplementary performance provided by the network. Therefore, in practical product applications, the Q.931 series is often used as the interface between the system core call control processing module and each type of relay processing module and user processing module, such as the "call control processing module" of FIG. A general control processing interface between "and the PRA Signaling Processing Module".

As shown in Figure 2, for an NGN network supporting the ITU-T Q.931 protocol, the MGW with embedded SG (Signaling Gateway) function implements processing of the physical layer and the data link layer, and carries the network layer Q.931 content. Communicate with the MGC on IP/SCTP/IUA. The PRA module in the MGC is responsible for processing the Q.931 message content and interacting with the call control processing module through the universal call control processing interface to complete the control process of the entire call process.

In order to meet the requirements of different R2 signaling standards in different countries, a signaling conversion function can be implemented at the R2 signaling access point to convert the R2 signaling into PRA signaling, and then access the MGC with Q.931. The conversion function can be implemented as a stand-alone component or as part of the MGW, as shown in Figure 2.

The advantage of this implementation scheme is to shield the difference implementation of R2 standards in different countries in the R2 PRA conversion box. For the specific R2 standard requirements of a specific country, only need to develop different R2/PRA conversion functions, and other processing of MGW. Modules and MGC overall equipment, no need to make any modifications. At the same time, the interface between the MGC and the MGW is stable, and it does not have to be changed frequently due to the R2 requirements of different countries. It is beneficial for the MGC: MGW devices and the MGW devices to be compatible with each other, and the R2/PRA conversion box is implemented by independent components. The advantage is even more obvious.

However, this implementation also brings some defects and improvements that need to be perfected. That is, R2 signaling usually needs to implement TOF (Tmnk Offering) long-distance attendant insertion requirements, and no related messages and information are defined in ITU-T Q.931. The unit, therefore, cannot implement the long distance attendant insertion function. Summary of the invention

It is an object of the present invention to provide a method and system for implementing attendant insertion in an NGN that can implement an attendant insertion service in an NGN network.

The invention provides a method for realizing long distance attendant insertion, which is applied to adopt the Q931 protocol. The next generation network includes: when the switching device receives the telephone call and finds that the called terminal of the call is talking, the switching device sends a long distance attendant insertion signal to the media gateway, and the media gateway converts the long distance attendant insertion signal into the operator indication message. And sending an attendant indication message to the media gateway controller to control the call of the called terminal.

The attendant indication message includes an attendant instructing start message, an attendant instructing end message, and an attendant instructing a ringing message.

The attendant indicates that the message is a newly added message.

The attendant indication message can be set in an existing message.

The attendant indication message can be set in a NOTIFY message.

The present invention also provides a long distance attendant insertion system in a next generation network employing the Q931 protocol, the system comprising:

a switching device, configured to send a long distance attendant insertion signal to the media gateway;

a media gateway, configured to convert the long distance attendant insertion signal and the attendant indication message, and send the attendant indication message to the media gateway controller;

The media gateway controller is configured to receive an operator indication message of the media gateway, and perform call control according to the operator indication message.

The media gateway controller includes:

a group rate access signaling processing module, configured to process an operator indication message;

The call control processing module is configured to perform control processing on the call according to the operator indication message. The present invention also provides a media gateway adopting a Q931 protocol, where the media gateway includes an R2 signaling and a base rate access signaling conversion unit, and is used for converting between a long distance attendant insertion signal and an operator indication message.

The present invention also provides a media gateway controller adopting the Q931 protocol, where the media gateway controller includes:

The call control processing module is configured to perform control processing on the call according to the operator indication message. According to the present invention, by extending the message and information unit supporting the TOF long distance attendant insertion requirement, The R2 signaling standard is implemented by R2/PRA conversion access under the NGN architecture, thereby realizing the long-distance attendant insertion function. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an NGN network diagram supporting PRA signaling;

Figure 2 shows an NGN network diagram for implementing R2 signaling access through itR2 to PRA;

Figure 3 is a flow chart showing the long distance attendant insertion call of the present invention;

Figure 4 shows a network diagram of the present invention for implementing long distance attendant insertion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to facilitate the understanding and implementation of the present invention, the embodiments of the present invention are described in conjunction with the drawings.

The invention realizes the R2 signaling standard through R2/PRA conversion access under the NGN architecture by extending the message and information unit supporting the TOF long-distance attendant insertion requirement on the basis of the existing ITU-T Q.931, and A technical solution to support long distance attendant insertion. The extended ITU-T Q.931 is called the ITU-T Q.931+ protocol.

In order to implement the present invention, the ITU-T Q.931 protocol is first extended, and the specific extensions are defined as follows: 1. Adding an attendant indication message OPR_MSG

The message can be sent to the network by the calling user (such as the operator) and sent by the network to the called user for transmitting the operation information of the operator. The operator indication message OPR_MSG is defined as follows:

The attendant indicates that the message type encoding is defined as follows: T N2006/002165

In the above table, the meanings of the information elements such as protocol authentication, call reference, and message type are as follows: Protocol authentication is the first part of each Q931 message, and is used to distinguish the user-network interface call control message from other messages. . For the Q.931 User-Network Call Control message, the protocol discriminator has a fixed value of 0x08.

The call reference is the second part of each Q931 message and is used to identify the call or facility registration/revocation request involved in the message on the local user-network interface.

The message type is the third part of each Q931 message, and the purpose of the message type is to identify the function of the message being sent. As the new OPR-MSG message of the present invention, a new message type identifier ID needs to be defined, for example, the value 0x92.

According to the invention, the operator indication message (OPR_MSG) is a newly extended message.

The attendant instruction information unit in the attendant instruction message is described below.

The purpose of the attendant indicating information unit is to explain the logical meaning of an operator's operation, and the exchange processing program performs corresponding attendant insertion process processing according to the instruction. The operator instructs the coding of the information unit ^:

The attendant indicates the content definition of the information unit:

The specific meaning of the operation value of the third octet operator is:

Attendant operation indication value

8 7 6 5 4 3 2 1 Meaning

0 0 0 0 0 0 0 0 Operator insertion start (TRUNK-OFFERING-START)

0 0 0 0 0 0 0 1 Operator insertion is complete (TRUNK-OFFERING- END)

0 0 0 0 0 0 1 0 Operator re-ringing (TRUNK-OFFERING-RING) All other values are preserved τ

As shown in FIG. 3, the basic call flow of the long distance attendant insertion is described in detail below.

Step 1. The operator calls the called user through the R2 relay of the switching device. If the called user is in a call and is allowed to be inserted, the MGC notifies the MGW through the ALERTING message of Q.931+, and the MGW converts the ALERTING message through the R2/PRA. The box is converted to R2 signaling B3 (indicating that the called user is busy) to send to the switching device.

The called user is in a call and allowed to be inserted generally means that the priority of the ongoing call is less than the priority of the attendant to insert the service. For example, in the following cases, the specified called user cannot usually be inserted in the following situations: (a) the inserted user is an operator who is not a normal user or has the call state do not disturb right; (b) the inserted user is called in the original call. Party, the calling party is the operator user, the priority user; (c) the service attribute of the call into which the user is located is not the local office, the local call; (d) the inserted user is using the conference call, call waiting, three-party calling service; ) The inserted user is making an internet call.

Step 2: The attendant learns that the called party is busy by the switching device, and sends a TOF signal to the MGW to start the attendant insertion process. The R2/PRA conversion box converts the OPR-MSG message to the MGC of the Q.931+ and carries it to the MGC. The indication information unit ET_OPERATOR_INDICATION indicates TRUNK_OFFERING_START, indicating the start of the attendant insertion. When the MGC receives the message, it controls the called user to listen to the inserted tone and start the three-party call. At this point, the called user can hear the inserted tone or the attendant voice notification that there is a long distance call.

Step 3: After the attendant inserts, the attendant insertion process may be ended according to the situation. At this time, the attendant may send a TOF signal to the MGW through the switching device, and the message carries the attendant end indication. The R2/PRA conversion box converts the OPR-MSG message of the Q.931+ to the MGC, and the message carries the information element ET_OPERATOR_INDICATION indicates TRUNK_OFFERING_END, indicating the end of the attendant insertion. When the MGC receives the message, it controls the called user side to return from the three-party call state to the state before the plug-in.

Step 4: The called user terminal can choose to hang up to answer the long distance call, and the on-hook message triggers the MGC to The MGW sends a DISCONNECT message, and the R2/PRA conversion box converts it to clear-back signaling (indicating that the called party hangs up) to send to the switching device.

Step 5: The attendant learns that the called terminal hangs up through the switching device, sends a RERING signal, and the R2 PRA conversion box converts it into an OPR-MSG message of the Q.931+ and reports it to the MGC. The message carries the information element ET_OPERATOR_INDICATION indicates the TRUNK — OFFERING— RING, indicating a re-ring. When the MGC receives the message, it controls the called user side to ring.

Step 6: The called user terminal picks up the phone, and the off-hook message triggers the MGC to send a CONNECT message to the MGW, and the R2/PRA conversion box converts it into answer signaling (representing the called response) and sends the message to the switching device, thereby causing the called terminal to Enter the call state with the long distance calling terminal.

The above describes the basic flow of long-distance attendant insertion. For different countries, there may be different process standard definitions. For example, the TOF signals of steps 2 and 3 may not be available, but the automatic timeout will proceed to the next step; the RERING signal of step 5 has some countries. Not defined, but the called user automatically rings again after hanging up.

Extensions to Q.931 protocol messages can also be implemented using other messages in existing protocols, such as NOTIFY messages. Specifically, the notification indicator information unit of the NOTIFY message is used, and the information unit is a notification expression, and the purpose is to indicate information related to the call. The third octet of the information element is the notification description Notification description, and only 0~2 values are currently used. The attendant insertion start can be expressed as 0x03, the attendant insertion end is indicated as 0x04, and the operator reverberation is indicated as 0x05.

As shown in FIG. 4, the present invention provides a system for implementing an attendant insertion. The system includes: a switching device, configured to send R2 signaling (such as a TOF signal) to an MGW, and receive an R2 signaling message of the MGW; It is used for the conversion between the TOF nickname in the R2 signaling and the OPR_MSG in the PRA signaling, and sends the converted OPR-MSG to the MGC; the MGC is used to receive the OPR-MSG of the MGW, and performs call control according to the OPR-MSG. The MGC includes a PRA signaling processing module and a call control processing module. The MGW includes an R2/PRA conversion box for converting between a long distance attendant insertion signal and an attendant indication message, and sends an operator indication message to the MGC. The PRA signaling processing module is configured to process PRA signaling (such as OPR-MSG), and the call control processing module is configured to perform control processing on the call according to PRA signaling (such as OPR-MSG). According to the present invention, the R2 signaling standard can be implemented by R2/PRA conversion access in the NGN architecture, and the problem of long-distance attendant insertion cannot be realized, and a fast implementation method for supporting R2 signaling standards in different countries is provided, and the NGN system equipment is reduced. Access to different national markets needs to support the development costs of the corresponding R2 standard.

While the invention has been described by the embodiments of the invention in the embodiments of the invention Request to limit.

Claims

Rights request

A method for realizing long-distance attendant insertion, which is applied to a next-generation network that communicates using the Q931 protocol, and is characterized in that it comprises:

When the switching device receives the telephone call and finds that the called terminal of the call is in a call, the switching device sends a long distance attendant insertion signal to the media gateway;

The media gateway converts the long distance attendant insertion signal into an extended attendant indication message in the Q931 protocol, and sends it to the media gateway controller;

The media gateway controller controls the call of the called terminal according to the operator indication message.

2. The method of implementing long distance attendant insertion according to claim 1, wherein the operator indication message comprises an operator indication start message, an operator indication end message, and an operator indication ringing message.

3. The method of implementing long distance attendant insertion according to claim 1, wherein the operator indication message is a newly added message.

The method for implementing long distance attendant insertion according to claim 1, wherein the operator indication message can be set in an existing message.

The method for implementing long distance attendant insertion according to claim 4, wherein the operator indication message is set in a NOTIFY message.

6. A long distance attendant insertion system implemented in a next generation network employing the Q931 protocol, the system comprising:

The system for implementing a long distance attendant insertion system according to claim 6, wherein the media gateway controller comprises: The group rate access signaling processing module is configured to process the operator indication message; the call control processing module is configured to perform control processing on the call according to the operator indication message.

A media gateway adopting the Q931 protocol, wherein the media gateway includes an R2 signaling and a base rate access signaling conversion box, and is used for converting between a long distance attendant insertion signal and an attendant indication message. The attendant indication message is sent to the media gateway controller.

A media gateway controller adopting the Q931 protocol, wherein the media gateway controller comprises:

The call control processing module is configured to perform control processing on the call according to the operator indication message.