WO2008113234A1

WO2008113234A1 - Method for realizing refer message expansion to pstn/isdn terminal

Info

Publication number: WO2008113234A1
Application number: PCT/CN2007/003826
Authority: WO
Inventors: Min Shen
Original assignee: Zte Corporation
Priority date: 2007-03-16
Filing date: 2007-12-27
Publication date: 2008-09-25
Also published as: CN101267322A; CN101267322B

Abstract

A method for realizing REFER message expansion to the PSTN/ISDN terminal comprises: setting the indication message agent module in the NGN, the indication message agent module receiving the REFER message transmitted to the PSTN/ISDN terminal, then the indication message agent module acquiring the REFER request parameter in the message,if it meets the corresponding indication message agent operation, returning the REFER receiving the response message to the indication party, finally, the indication message agent module executing the indication message agent operation.

Description

REFER message extension implementation method for PSTN/ISD terminal

Technical field

The present invention relates to the field of communications, and in particular, to a REFER message extension implementation method for a PSTN (Public Switched Telephone Network)/ISDN (Integrated Services Digital Network) terminal.

Background technique

In the Next Generation Network (NGN) with IP (Internet Protocol) Multimedia Subsystem (IMS) as the core, the initial session protocol (SIP) is adopted as the service control protocol, and various communication services can be used by the user's intelligent terminal and network. The application server (AS) set by the operator is completed.

Figure 1 is a schematic diagram of a typical service implementation architecture in NGN. The application server (there may be multiple, corresponding to different services) is connected to the service-call session control function (S-CSCF) of the user home network, and the SIP service control message between the user terminal A and the user terminal B (using The dotted line identifies the agent-call session control function (P-CSCF) in the respective visited network, the S-CSCF in the home network, and the application server (may pass through different application servers depending on the type of user service). The application server can implement rich services by performing various processing on service control messages. The user terminal A and the user terminal B exchange and negotiate the media parameters supported by the two parties, and establish an IP media stream connection (identified by a solid line) between the two, and the IP media stream is used for transmitting data such as a voice packet. If the application server is equipped with a media processing function, a media stream connection can also be established between the user terminal and the application server to implement a human-machine conversation service, such as an automatic voice service of the bank.

The NGN needs to communicate with the traditional PSTN/ISDN, including the IMS intelligent terminal in the NGN interworking with the terminal in the PSTN/ISDN, and providing the NGN specific service for the terminal in the PSTN/ISDN.

2 is a schematic diagram of a system architecture of interworking between NGN and PSTN/ISDN. Among them, two functional entities are added between NGN and PSTN/ISDN: Media Gateway (MGW) for NGN The IP media stream is converted to a voice stream in the PSTN/ISDN, and the opposite conversion is performed; a Media Gateway Control Function (MGCF) is used to convert the SIP service message in the NGN into a TUP in the PSTN/ISDN (Telephone User Part) , the telephone user part) /ISUP (ISDN User Part), the business message, and the opposite conversion, and control of the MGW.

Some major SIP service messages are associated with TUP/ISUP service messages. For example, the INVITE message in SIP can correspond to IAM (initial address message) in TUP/ISUP, and the BYE message in SIP can be Corresponding to REL (Release Message) in TUP/ISUP, and 200 OK (Response Response) message in SIP can correspond to ANM (Response Message) or RLC in TUP/ISUP according to the request message it responds to (release complete) Message).

Figure 3 is an example of an NGN IMS terminal establishing and releasing a call with a PSTN/ISDN terminal. The user terminal-A is a user terminal in the NGN, and the P-CSCF-A, the S-CSCF-A, and the AS-A respectively represent the P-CSCF, the S-CSCF, and the AS corresponding to the user terminal-A in the NGN. For simplicity, P-CSCF-A, S-CSCF-A and AS-A are described as a message entity, and MGCF and MGW are described as a message entity, and user terminal-B in PSTN/ISDN is not marked.

As shown in FIG. 3, the user terminal-A in the NGN issues an INVITE request to the user terminal-B in the PSTN/ISDN (PSTN or ISDN) (steps El to E2); the MGCF converts the request into an IAM in the PSTN/ISDN. The message is sent to the PSTN/ISDN switch where the user terminal-B is located (step E3); after the user terminal-B picks up the call, the PSTN/ISDN switch returns an ANM message to the MGCF (step E4); the MGCF converts the ANM message into a SIP. The 200 OK (Answer Response) message is sent to User A (steps E5 - E6); User Terminal-A sends an ACK (Invite Response Acknowledgement) message to MGCF (steps E7 ~ E8), this message does not need to be converted to PSTN/ISDN Message in. Through the above message interaction, an IP media stream is established between the user terminal-A and the MGW, and a voice stream is established between the MGW and the PSTN/ISDN switch; through the MGW conversion, the user terminal-A and the user terminal-B can Make a call.

4 is a flow chart of a method for implementing a REFER message in the SIP protocol. REFER (Indication) is a special message defined in the SIP protocol. Its function is as follows (for the sake of simplicity, the P-CSCF, S-CSCF and AS of the same user are described as a message entity).

The user terminal-B acts as an instructing party and sends a REFER to the user terminal-A as the instructed party. The message (steps F1~F3), the main parameters carried by the message are: Refer-To, used to indicate the address information of a third-party user (such as user terminal-C); and method, used to indicate a method, such as INVITE , that is, an invitation is sent to a third party, MESSAGE, that is, the information is sent to the third party; the user terminal-A returns a response message to the user terminal-B (steps F4 to F6), and initiates a corresponding message to the user terminal-C according to the REFER request message. Operation request, the operation request adopts the method indicated by the above method parameter (steps F11 ~ F16, the interaction message involved in the operation request may be many, here is only an example); before the user terminal-A initiates the above operation request, the operation request execution process After and after completion, the user terminal-A can notify the user terminal-B of the execution of the operation request by using the NOTIFY message defined by the SIP protocol as needed, and the user terminal-B responds appropriately to the NOTIFY message (step F21). ~F26).

The REFER message can be used to implement services such as call forwarding, conference, busy callback, and three-party calling. It is an important message in SIP.

Figure 5 is a flow diagram of a typical call forwarding service that implements a REFER message. For the sake of simplicity, network devices such as P-CSCF and S-CSCF are omitted in this figure. As shown in Figure 5, the call forwarding service includes the following steps:

User terminal-A (user A) and user terminal-B (user B) are in a process of conversation, user terminal-A's application server (application server-A) and user terminal-B's application server (application server-B) Participate in the call process, provide services for the respective service objects; then initiate a call hold request by the user terminal-B to set the user terminal-A to the call hold state, that is, the service message can be intercommunicated, but the media stream is temporarily interrupted; the user terminal-B The REFER message is used to send a transfer request to the user terminal-A (steps D1 to D3), wherein the Refer-To parameter is the user C number, and the method parameter is INVITE; after the user terminal-A indicates accepting the request (steps D4 to D6) User terminal-B sends an on-hook request to user terminal-A, disconnects the call channel between the two (steps D7~D12); user terminal-A sends an invite request to user terminal-C (user C), at the user A call is established between the terminal-A and the user terminal-C (steps D19 to D27); in the above process, the user terminal-A is ready to send an invitation request to the user terminal-C and is turned on. After -C terminal session, may be performed using a NOTIFY message notification of relevant operation request to the user terminal -B (respectively corresponding to step D13 ~ D18, Step D28 ~ D33).

Figure 6 is a flow chart of a typical conference service. For the sake of simplicity, this figure is omitted Network devices such as P-CSCF and S-CSCF. The application server-A provides service for the user A, and also provides the conference service function for all users. The voice channel can be established simultaneously with multiple users, and the voices of multiple users are mixed and then sent to each user. . As shown in Figure 6, the conference service includes the following steps:

First, user A (user terminal-A) sends an invitation request to the conference service server (application server-A), creates a conference resource, and establishes a call between user A and the conference service server (steps P01 to P04); user A adopts The REFER message sends a conference invitation request to the user B (user terminal-B) (steps P11 to P16), wherein the Refer-To parameter is the conference service server address, and the method parameter is INVITE; the user B sends the conference service server according to the indication of the REFER request. Sending an invitation request, establishing a call between user B and the conference service server, so that user B joins the conference (steps P21 ~ P27); user B can send a NOTIFY message to user A, indicating that they have joined the conference, the user A responds to the NOTIFY message (steps P31 to P36). In addition, steps P41 to P49 describe another method for inviting a user to join a conference by using a REFER message: User A sends a conference invitation request to the conference service server, where the Refer-To parameter is the user C number, the method parameter is INVITE, and the conference service is The server actively sends an invitation request to the user C, and establishes a call between the user C and the conference service server; the conference service server sends a NOTIFY message to the user A, informing the user that the C has joined the conference, and the user A responds to the NOTIFY message (step P51 ~ P52).

As can be seen from the above, NGN can achieve very rich services with REFER messages. However, since there is no message corresponding to the REFER in the TUP/ISUP, the PSTN/ISDN terminal can only serve as a third party of the REFER, that is, the user terminal-C in the call forwarding service of FIG. 5 or the user terminal in the conference service in FIG. -C, but cannot serve as the initiator and the second party of the call forwarding service (user terminal-B and user terminal-A in Fig. 5) or the invitation terminal and the invited terminal of the conference service (the user terminal in Fig. 6) -A and user terminal -B), which greatly limits the use of NGN services by PSTN/ISDN terminals.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the REFER message implementation method in the prior art, and to propose a REFER message extension implementation method for a PSTN/ISDN terminal, so that The PSTN/ISDN terminal can serve as the indicator and the indicated party of the REFER message, and more fully utilizes the rich service provided by the NGN using the REFER message.

In order to achieve the above object, the present invention provides an indication REFER message extension implementation method for a public switched telephone network or an integrated services digital network PSTN/ISDN terminal, applied to NGN and PSTN interconnected by a media gateway control function MGCF and a media gateway MGW. /ISDN, the method includes the following steps:

A, setting an indication message proxy module in the NGN, and configuring, by the configuration, that the REFER message sent to the PSTN/ISDN terminal is received and processed by the indication message proxy module;

B. When the indication message proxy module receives the REFER request message of the PSTN/ISDN terminal as the indicated party, obtains the REFER request parameter in the message, and supports the corresponding indication message proxy operation, and returns a REFER acceptance response message to the indication party. ;

C: The indication message proxy module performs an indication message proxy operation as the indicated party according to the REFER request parameter.

Further, the above method may also have the following features:

And the indication message proxy module sends a notification NOTIFY request to the indication party to notify the indication party of the execution of the operation of the message proxy, before the execution of the indication message proxy operation and/or after the execution is completed, and/or after the execution is completed, the indication party is The NOTIFY request is answered.

Further, the above method may also have the following features:

The Refer-Proxy parameter of the instruction message proxy module in the REFER request parameter is the number of the third-party user, and the method parameter is the invitation INVITE, first communicating with the indicated party, and the indicated party establishing the REFER message corresponds to the same. a communication link between the MGWs, and acquiring the MGW media parameter information of the indicated party, and then sending the same to the third party specified by the Refer-To parameter, and obtaining the third-party media from the response message. The parameter information is sent to the MGW corresponding to the indicated party, and the MGW establishes an IP media stream connection with the third party.

Further, the above method may also have the following features:

The Refer-Pro parameter of the instruction message proxy module in the REFER request parameter is The third-party user's number, when the method parameter is invited to the INVITE, performs the following instructions for the message proxy operation:

C1: the indication message proxy module sends an INVITE request message to the MGCF corresponding to the indicated party;

C2, the MGCF converts the INVITE request into an IAM message, and sends the INVITE request to the PSTN/ISDN switch corresponding to the indicated party;

C3, after the instructed user picks up the phone, the PSTN/ISDN switch returns an ANM message, and establishes a voice stream connection between the PSTN/ISDN switch and the corresponding MGW;

C4, the MGCF converts the ANM message into an INVITE response response message in the SIP, and sends the message to the indication message proxy module, where the message carries the media parameter information of the MGW;

C5, the indication message proxy module sends an INVITE request to the third party through the NGN network, where the message carries the media parameter information of the MGW;

C6, the third party returns an INVITE response response message to the indication message proxy module by using the NGN network, where the message carries media parameter information of the third party;

C7, the indication message proxy module acquires the media parameter information of the third party from the INVITE response response message, and sends an INVITE response confirmation message to the MGCF, where the message carries the media parameter information of the third party;

C8, the MGCF provides the media parameter information of the third party to the MGW, and the MGW establishes an IP media stream connection with the third party, and implements the indicated party and the third party. call.

Further, the above method may also have the following features:

In step A, the routing configuration information is modified, so that the message sent to the MGCF is first sent to the indication message proxy module, and then forwarded to the MGCF by the indication message proxy module; or, by the service-call session control function S. The message filtering criteria are set at the -CSCF such that the REFER message is first sent to the indication message proxy module for processing.

Further, the above method may also have the following features: The indication message proxy module is integrated in the MGCF or exists independently as a network element device.

In order to solve the above technical problem, the present invention also provides an indication REFER message extension implementation method for a public switched telephone network or an integrated service digital network PSTN/ISDN terminal, which is applied to be interconnected by a media gateway control function MGCF and a media gateway MGW. NGN and PSTN/ISDN, this method consists of the following steps:

A, setting an indication message proxy module that can interact with the MGCF in the NGN;

Β ', the PSTN/ISDN terminal as the EFER request indicator notifies the indication message proxy module to send a REFER request message, providing a message destination address and a REFER request parameter including Refer-To and method;

C. The indication message proxy module constructs a REFER request message according to the REFER request parameter, and sends the message to the indicated party of the REFER request corresponding to the destination address of the message;

D': The indicated party returns an acceptance response message after receiving the REFER request message, and initiates a corresponding operation to the third party indicated by the Refer-To parameter according to the method indicated by the method parameter.

Further, the above method may also have the following features:

And the indicated party sends a notification NOTIFY message to the indication message proxy module before and/or during execution of the corresponding operation as needed, and after the indication message proxy module receives the The instructor reports relevant information in the NOTIFY message.

Further, the above method may also have the following features:

The indicating message proxy module reporting related information in the NOTIFY message to the indicating party may be implemented in one of the following ways:

If the indicator user has hanged up, the indication message proxy module calls the indicator user to play a prompt tone to the user A according to the related information in the NOTIFY message;

If the instructing party user is not on-hook, the indication message proxy module reports the related information in the NOTIFY message to the instructing user through the voice prompt function.

In order to solve the above technical problem, the present invention also provides a public switched telephone network or The method for implementing the REFER message extension of the PSTN/ISDN terminal of the integrated service digital network is applied to the NGN and PSTN/ISDN interconnected by the media gateway control function MGCF and the media gateway MGW, and an indication that the MGCF can interact with the MGCF is first set in the NGN. a message proxy module, and implementing the REFER message extension of the PSTN/ISDN terminal as an indicator by the following steps: a, the indicator user dials the number of the indication message proxy module through the PSTN/ISDN terminal, and establishes an indication message proxy module with the indication message Between calls;

b, in the voice prompt of the indication message proxy module, the indicator user input parameter information, including the indicated party number, the third party number, and the selected operation method;

The instruction message proxy module constructs a REFER request message according to the parameter information, and uses the third party number as a Refer-To parameter, and sends the method as a method parameter to the indicated party;

d, the indicated direction indicating the message proxy module returns a REFER accept response message; e, the indicated party initiates the operation to the third party by using a method indicated by a method parameter.

Further, the above method may also have the following features:

Step b: The operation method selected by the indicator is an invitation INVITE, and the method parameter in step c is INVITE, and the step e is instructed to send a call invitation request to the third party to establish a call with the third party.

Further, the above method may also have the following features:

After the call of the instructed party and the third party is established, the indication is sent to the indication message proxy module to send a NOTIFY message; after the indication message proxy module receives the NOTIFY message, if the indication party is found at this time If the call has not been hanged, the call setup status of the indicated party and the third party is reported to the indication party by voice prompting.

In summary, by using the REFER message extension implementation method of the present invention,

The PSTN/ISDN uses the REFER message and related services as the instructed party, the instructing party, and the third party, and expands the use scope of the NGN service. BRIEF abstract

1 is a schematic diagram of a typical service implementation architecture in an NGN;

2 is a schematic diagram of a system architecture of interworking between NGN and PSTN/ISDN;

Figure 3 is an example of an NGN IMS terminal establishing and releasing a call with a PSTN/ISDN terminal;

4 is a flowchart of a method for implementing a REFER message in a SIP protocol;

Figure 5 is a flow chart of a typical call forwarding service;

Figure 6 is a flow chart of a typical conference service;

7 is a flowchart of a method for implementing a REFER message extension of a PSTN/ISDN terminal of the present invention as an indicated party;

8 is a flow chart of implementing a call forwarding service by using a PSTN/ISDN terminal as an indicated party by using the method of the present invention;

9 is a flow chart showing a method for implementing a REFER message extension of the PSTN/ISDN terminal of the present invention as an indicator;

Figure 10 is a flow diagram of implementing a REFER message using the PSTN/ISDN terminal as an indicator using the method of the present invention.

Preferred embodiment of the invention

It can be seen from the above description that the MGCF is a functional entity responsible for service message conversion between the NGN and the PSTN/ISDN, and the service message sent by the NGN terminal to the PSTN/ISDN terminal is usually processed and forwarded by the MGCF. Therefore, in order to extend the REFER message for the PSTN/ISDN terminal, the PSTN/ISDN terminal can be used as the indicated party of the REFER message, and the function of the MGCF needs to be extended. In addition, since the PSTN/ISDN network does not support the REFER request message, in order to make the PSTN/ISDN terminal be the indicator of the REFER message, it is necessary to set an indication message proxy module in the NGN network to implement the corresponding function.

The invention will now be described in detail in conjunction with the drawings and embodiments.

The invention sets an indication message proxy module for the PSTN/ISDN in the NGN, which is configured by The REFER message sent to the PSTN ISDN terminal is processed by the indication message proxy module, and the module receives the REFER message parameter provided by the PSTN/ISDN terminal, and constructs and sends a corresponding REFER message according to the parameter.

The configuration of the REFER message sent to the PSTN/ISDN terminal by the indication message proxy module may be implemented in various manners, for example: by modifying the routing configuration information, the message sent to the MGCF is first sent to the indication message proxy module. And then forwarded to the MGCF by the indication message proxy module; or set the message filtering criterion at the S-CSCF, so that the EFER message is first sent to the indication message proxy module for processing.

The PFERN/ISDN terminal implemented by the above-mentioned indication message proxy module will be described as a REFER message extension implementation method of the indicated party and the instructor, respectively.

For the sake of simplicity, the PSTN/ISDN terminal-A (user A) as the indicated or instructor of the REFER message is not listed in FIG. 7 to FIG. 10, and the terminal is based on the relevant protocol of the PSTN/ISDN network and PSTN/ISDN. The switches are connected to complete the corresponding operations, and there is no special bead change in the present invention.

Figure 7 is a flow chart showing the implementation of the REFER message extension of the PSTN/ISDN terminal of the present invention as the indicated party. The user terminal -B is an NGN terminal, the user terminal -A is a PSTN/ISDN terminal, the user terminal -B is an indication party of a REFER message, and the user terminal -A is an indicated party of a REFER message.

As shown in FIG. 7, the PFERN/ISDN terminal as the REFER message extension implementation method of the indicated party includes the following steps:

Step G1 G2: The indication message proxy module corresponding to the user terminal-A receives the REFER request message sent by the user terminal-B, and obtains the REFER request parameters of the Refer-To, method, and the like included in the message; Step G3 ~ G4: indication message The proxy module returns a REFER accept response message to the user terminal-B;

By analyzing the REFER request parameter, if the indication message proxy module does not support the corresponding indication message proxy operation, the REFER reject response message is returned to the user terminal-B, and the subsequent operation is not performed; Step Gi l: instructing the message proxy module to perform the corresponding indication message proxy operation as the indicated party according to the REFER request parameter;

Steps G31 ~ G34: Instructing the message proxy module to send a NOTIFY request to the user terminal-B before, during, and after the execution of the indication message proxy operation, as needed to indicate the execution of the message proxy operation, the user terminal - B responds to the NOTIFY request _3⁄4

Figure 8 is a flow diagram of a call forwarding service implemented by a PSTN/ISDN terminal as an indicated party using the method of the present invention. Among them, NGN User B (User Terminal -B) sends a REFER request to PSTN/ISDN User A (User Terminal -A) to instruct User A to establish a call with User C (User Terminal -C). As shown in FIG. 8, the method for implementing the call forwarding service by the method of the present invention includes the following steps: Step HI ~ H2: The indication message proxy module corresponding to the user terminal-A receives the REFER request message sent by the user terminal-B, and obtains the The REFER request parameter of the Refer-To, method, and the like included in the message; wherein the Refer-To parameter is the number of the user terminal-C (NGN user), and the method parameter is INVITE;

Step H3 - H4: Instructing the message proxy module to return a REFER accept response message to the user terminal -B;

The indication message proxy module performs a corresponding indication message proxy operation as the indicated party according to the REFER request parameter; the operation includes the following steps:

Step H11: Instructing the message proxy module to send an invite (INVITE) request message to the MGCF corresponding to the user terminal-A;

Step H12: The MGCF converts the above request request into an IAM message and sends it to the PSTN/ISDN switch corresponding to the user terminal -A;

Step H13: After the user A picks up the phone, the PSTN/ISDN switch returns an ANM message, and establishes a voice stream connection between the PSTN/ISDN switch and the MGW; that is, establishes a required communication link between the user terminal-A and the corresponding MGW. Road

Step H14: The MGCF converts the ANM message into an invitation response message sent in the SIP to the indication message proxy module, where the invitation response response message carries the MGW media parameter information of the user terminal-A; Step Η15~Η16·. Instructing the message proxy module to send an invitation request to the user terminal-C, where the invitation request message carries the media parameter information of the MGW of the user terminal-A;

Step H17 ~ H18: The user terminal -C returns an invitation response response message to the indication message proxy module, and instructs the message proxy module to obtain the media parameter information of the user terminal -C from the invitation response response message;

Step H19: Instructing the message proxy module to send an invitation response confirmation message to the MGCF, and providing the media parameter information of the user terminal-C to the MGW through the message;

Through the above operations, both the MGW and the user terminal-C obtain the media parameter information of the other party, so that the IP media stream connection between the two can be established; the MGW converts the voice stream and the IP media stream to realize the user A and User C's call;

Step H31 - H34: After the user terminal -A establishes a call with the user terminal -C, the indication message proxy module sends a NOTIFY message to the user terminal -B, notifying that the call transfer is successful, and the user terminal -B replies to the NOTIFY message.

It can be seen from steps H 11 to H 19 that since the method parameter of the REFER message is INVITE, the instructed party of the REFER message needs to establish a communication resource such as a voice stream connection with the MGW, and the third party that the MGW acquires the REFER message (user The communication parameter information such as the media parameter of the terminal-C), and the third party of the REFER message acquires the communication parameter information such as the MGW media parameter of the indicated party.

The above is a method for implementing the REFER message extension of the PSTN/ISDN terminal as the indicated party. The REFER message extension implementation method of the PSTN/ISDN terminal as the indication party will be described below with reference to the accompanying drawings and embodiments.

9 is a flow chart of a method for implementing a REFER message extension of a PSTN/ISDN terminal of the present invention as an indicator. The user terminal-B (user B) is an NGN terminal, the user terminal-A (user A) is a PSTN/ISDN terminal; the user terminal-B is an indicated party of a REFER message, and the user terminal-A is an indicator of a REFER message. , user terminal -C (user C) is a REFER message Third party. As shown in FIG. 9, the EFER message extension implementation method of the PSTN/ISDN terminal as an indicator includes the following steps:

Step J1: User A provides a REFE request parameter to the indication message proxy module and notifies the indication message proxy module to send a REFER message;

Step J1 may be implemented in the following manner: Instructing the message proxy module to provide a voice media interaction function, the user A dialing the number indicating the message proxy module, providing the REFER request parameter to the indication message proxy module through the voice interaction technology, and notifying the user to send the REFER message; Step J1 can also be implemented by means of digital communication.

Step J11 ~ J12: Instruct the message proxy module to construct a REFER request message according to the parameters provided by the user A, and send it to the user terminal -B;

Steps J13 to J14: The user terminal-B returns an acceptance response message to the indication message proxy module; Steps J21 to J26: the user terminal-B uses the method indicated by the method parameter to initiate the user terminal-C indicated by the Refer-To parameter. Corresponding operation;

Step J31 - J34: User B sends a NOTIFY notification message to the indication message proxy module as needed;

Step J41: Instruct the message proxy module to report the related information in the NOTIFY message to the user A. The above step J41 can be implemented in one of the following ways:

N1) If user A is on-hook, the message proxy module is instructed to call user A to play a prompt tone to user A according to the relevant information in the NOTIFY message, such as: "The operation you requested has been completed, ; or

N2) If the user A does not have a machine, the indication message agent module can report the related information in the NOTIFY message to the user A through the voice prompt function.

Figure 10 is a flow diagram of implementing a REFER message with a PSTN/ISDN terminal as an indicator using the method of the present invention. The user terminal -A (user A) is a PSTN/ISDN terminal, which is an indicator of the REFER message, the user terminal -B (user B) is the indicated party of the REFER message, and the user terminal -C (user C) is a REFER message. Third party. As shown in FIG. 10, the method for implementing a REFER message by the PSTN/ISDN terminal as an indicator includes the following steps: Steps K1 to K5: User A dials the number indicating the message proxy module, and establishes a call between the user terminal-A and the indication message proxy module through a normal call establishment procedure (the MGW is responsible for converting in the voice channel);

Step K6: Under the prompt of the voice device indicating the message proxy module, the user A sequentially inputs the user B number, the user C number (as the Refer-To parameter), and the operation method that is desired to be used (as the method parameter, where the user selects the INVITE as Example) and other parameter information;

Step Kl l ~ K12: Instructing the message proxy module to construct a REFER request message according to the above parameter information, and sending the REFER request message to the user B;

Step K13 ~ K14: User B returns a REFER request to the indication message proxy module to accept the response message;

Steps K21 ~ K29: User B initiates a call invitation request to user C by using the method indicated by the method parameter (using INVITE as an example) to establish a call with user C;

Step K31 - K34: After the call is established, user B sends a NOTIFY message to the indication message proxy module;

Step K41: Instruct the message proxy module to receive the NOTIFY message, and find that the user A has not hanged up yet, and report the call establishment of the user B and the user C to the user A by using a voice prompting manner; Step K42 K45: After the user A hears the notification Hang up, disconnect and talk to the message broker module.

The foregoing describes the PFERN/ISDN terminal as the REFER message extension implementation method of the indicated party and the instructing party, and can provide the PSTN/ISDN terminal user with one or both of the above methods as needed.

In addition, the indication message proxy module may exist as a separate server to provide an indication message proxy function for terminals in the PSTN/ISDN network; or may be integrated in the MGCF, thereby reducing the indication message between the proxy module and the MGCF Interactive messages to improve communication efficiency.

Industrial applicability The REFER message extension implementation method of the present invention is applicable to an NGN network and a PSTN/ISDN network interconnected by the MGCF and the MGW, so that the PSTN/ISDN terminal can use the REFER message and related services as the instructed party, the instructing party, and the third party, and the related service is expanded. The scope of use of the NGN business.

Claims

Claim

A method for implementing a REFER message extension for a public switched telephone network or an integrated service digital network (PSTN/ISDN terminal) for applying NGN and PSTN/ISDN interconnected by a media gateway control function MGCF and a media gateway MGW, the method comprising The following steps are: A. setting an indication message proxy module in the NGN, and configuring, by the configuration, that the REFER message sent to the PSTN/ISDN terminal is received and processed by the indication message proxy module;

2. The method of claim 1 wherein:

3. The method of claim 1 or 1 wherein:

4. The method of claim 1 or 2, characterized by:

The instruction message proxy module in step C indicates that the Refer-To parameter in the REFER request parameter is the number of the third-party user, and when the method parameter is the invitation INVITE, the following indication message agent is executed. Operation:

CI: the indication message proxy module sends an INVITE request message to the MGCF corresponding to the indicated party;

C4, the MGCF converts the ANM message into an INVITE response message in the SIP, and sends the message to the indication message proxy module, where the message carries the media parameter information of the MGW; C5, the indication message proxy module uses the NGN network to The third party sends an INVITE request, where the message carries media parameter information of the MGW;

C7, the indication message proxy module acquires media parameter information of the third party from the INVITE response response message, and sends an INVITE response confirmation message to the MGCF, where the message carries media parameter information of the third party;

C8, the MGCF provides the media parameter information of the third party to the MGW, and the MGW establishes an IP media stream connection with the third party to implement the call between the indicated party and the third party. .

5. The method of claim 1 wherein:

6. The method of claim 1 wherein:

The indication message proxy module is integrated in the MGCF or exists as a network element device independently.

7. A public switched telephone network or integrated service digital network PSTN/ISDN terminal The indication REFER message extension implementation method is applied to the NGN and PSTN/ISDN interconnected by the media gateway control function MGCF and the media gateway MGW, and the method comprises the following steps:

B, the PSTN/ISDN terminal as the REFER request indicator notifies the indication message proxy module to send a REFER request message, providing a message destination address and a REFER request parameter including Refer-To and method;

C. The indication message proxy module constructs an EFER request message according to the REFER request parameter, and sends the EFER request message to the indicated party of the REFER request corresponding to the destination address of the message;

D:: After receiving the REFER request message, the indicated party returns an accept response message, and initiates a corresponding operation to the third party indicated by the Refer-To parameter according to the method indicated by the method parameter.

8. The method of claim 7 wherein:

9. The method of claim 7 wherein:

If the instructing party user has already activated the machine, the indication message proxy module calls the indicator user to play a prompt tone to the user A according to the related information in the NOTIFY message;

If the instructing user does not have a GUI, the indication message proxy module reports the related information in the NOTIFY message to the instructing user through the voice prompt function.

10. An indication REFER message extension implementation method for a public switched telephone network or an integrated service digital network PSTN/ISDN terminal, applied to NGN and PSTN/ISDN interconnected by a media gateway control function MGCF and a media gateway MGW, first in NGN Setting an instruction message proxy module that can interact with the MGCF, and implementing a REFER message extension of the PSTN/ISDN terminal as an indicator by the following steps:

a, the indicator user dials the number of the indication message proxy module through the PSTN/ISDN terminal a code, establishing a call with the indication message proxy module;

d, the indicated direction indicates that the message proxy module returns a REFER accept response message; e, the indicated party initiates the operation to the third party by using a method indicated by the method parameter.

11. The method of claim 10 wherein:

12. The method of claim 11 wherein:

After the call of the instructed party and the third party is established, the indication is sent to the indication message proxy module to send a NOTIFY message; after the indication message proxy module receives the NOTIFY message, if the indication party is found at this time If the phone is not on-hook, the indicator party 4 is advertised to the instructing party 4 to establish a situation of the call between the instructed party and the third party.