CN101102610A

CN101102610A - A method for realizing user busy call forward in IMS centrally controlled service

Info

Publication number: CN101102610A
Application number: CNA2007101412757A
Authority: CN
Inventors: 谢宝国; 游世林; 郝振武
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2007-08-06
Filing date: 2007-08-06
Publication date: 2008-01-09
Anticipated expiration: 2027-08-06
Also published as: CN101102610B

Abstract

The method comprises: 1) calling user initiates a calling request to the called user, and establishes the circuit domain session between the called user and the IMS circuit domain control function of IP multimedia subsystem; 2) when the called user rejects the call, said called user sends the message of called user being busy to said IMS circuit domain control function via the local circuit domain access adapting function; said IMS circuit domain control function relays the message to the telecommunication application server; 3) said telecommunication application server initiates call forwarding on busy service.

Description

Realize the method for user busy call forward in a kind of IMS centralized control business

Technical field

The present invention relates to communication technical field, relate in particular to the method that realizes the User Determined User Busy Call Forwarding in a kind of IMS (IP Multimedia CoreNetwork Subsystem, IP Multimedia System) centralized control business.

Background technology

IP (Internet Protocol, network interconnection agreement) IP multimedia subsystem, IMS (IMS, IP MultimediaCore Network Subsystem) is a kind of IP-based network framework that proposes by third generation partner program 3GPP (3rd GenerationPartnership Project), it has made up an opening and service environment flexibly, support multimedia application, and provide abundant multimedia service for the user.

IMS is based on the communication network framework of IP, irrelevant with access technology, except being GPRS (General Packet Radio Service, GPRS), WLAN (WirelessLocal Area Network, WLAN (wireless local area network)) etc. packet access network provides outside the business, can also be GSM (Global System for Mobile communications, global system for mobile communications), UMTS mobile cellular networks such as (Universal Mobile Telecommunications System, unified mobile communcations systems) provides professional.

Mobile cellular network such as GSM, UMTS adopts circuit-switched technology, is called circuit (CircuitSwitched is called for short CS) territory, can provide basic speech business for the user, and based on the supplementary service of speech business.When IMS was inserted in the CS territory, it developed into a kind of access way, and business provides by IMS is unified fully, this technology be called IMS centralized control business (IMS CentralizedService, ICS).

IMS centralized control business has the following advantages:

(1) IMS provides consistent business for access waies such as circuit domain, packet domain, and network enabled merges;

(2) support the CS network to the evolution of IMS network;

(3) not only support to have ICS ability subscriber equipment, also support the existing subscriber equipment that does not possess the ICS ability, non-ICS subscriber equipment is also referred to as traditional subscriber equipment.

As shown in Figure 1, be that legacy user terminals is passed through the Organization Chart that realization IMS centralized control business is inserted in the CS territory, comprise following network element: user terminal 101 (User Equipment, be called for short UE), adaption function 102 (Local CS Access AdaptationFunction-network equivalent is inserted in the local circuit territory, be called for short L-CAAF-n), Visited Mobile Switching Center 103 (Visited Mobile Switch Center, be called for short VMSC), home subscriber server 104 (Home Subscriber Server, be called for short HSS), MGCF 105 (MediaGateway Control Function is called for short MGCF), media gateway 106 (Media Gateway, be called for short MGW), IMS circuit domain control function 107 (IMS CS Control Function is called for short ICCF), CSCF 108 (Call Session Control Function, be called for short CSCF), telecommunication application server 109 (Telecom Application Server is called for short TAS);

UE101 process L-CAAF-n102 sets up 3 paths to the ICCF107 in IMS territory: session control path, carrying control path and bearer path, wherein:

The session control path, be carried on the CS territory, UE101 adopts the CS control signaling of standard to insert L-CAAF-n102, L-CAAF-n102 adopts unstructured supplementary service data (UnstructuredSupplementary Service Data, be called for short USSD), ICCF107 is inserted through HSS 104 in this path then;

Carrying control path, UE101 adopts the CS control signaling of standard to insert L-CAAF-n102 and VMSC 103, and L-CAAF-n 102 both can separate with VMSC 103, also can unify, be linked into IMS by MGCF 105 then, arrive ICCF 107 by CSCF 108;

Bearer path by being that UE 101 is linked into IMS by VMSC 103 and MGW 106, and being set up medium with the remote user equipment of this session and is connected.

IMS centralized control business is utilized the interactive sessions control information between UE 101 and ICCF 107 of session control path, and sets up and the control media bearer by carrying control path, and ICCF 107 serves as the IMS user agent, replaces subscriber equipment to insert IMS.

TAS 109 servers can provide numerous supplementary services such as calling out maintenance, calling transfer, number demonstration, Call Forwarding for the user, therefore are called supplementary business server again.Call Forwarding services are a kind of supplementary services in the communication system, its branch unconditioned call connection, no-answer call connection, the CFB that calls forwarding on busy situations such as (Communication Forwarding Busy), wherein busy Network Determined User Busy and the two kinds of situations of User Determined User Busy of being divided into again of mobile subscriber.Network Determined User Busy is meant that the User Status of Network records for busy, is in the conversation as the user; User Determined User Busy is meant after the mobile subscriber receives the ring up notice and directly rejects response that network is transferred to its calling phone or the voice mail that sets in advance.

ICS must the support call forward-shifting service as a kind of telecommunication system.But do not have relevant flow process to realize the User Determined User Busy business at present in the IMS centralized control business, need the attainable flow process of service definition for this reason.

As shown in Figure 2, be on session control path, CS territory, IMS user A calls out the traditional mobile subscriber B that inserts from CS, carry out the FB(flow block) of conversation procedure, the roaming number of ICCF by user B makes a call to the called subscriber and sets up process, this process is called called process, and flow process is divided following step:

Step 201, CSCF receive called SIP (Session Initiation Protocol, the session initiation protocol) conversation request message that Calling Side user A initiates to callee side user B; CSCF is routed to the session request telecommunication application server (TAS, TelecomAplication Server) of being responsible for Call Forwarding services; The called conversation request message of TAS route is to ICCF;

Step 202, ICCF use USSD to initiate called request to L-CAAF-n on session control path, CS territory, carry calling number and called number in the called request;

Step 203, ICCF obtain the roaming number of user B, and the roaming number of utilization acquisition is routed to MGCF with calling subscriber's SIP conversation request through CSCF then;

Step 204, MGCF send out the initial address message (IAM, initial address message) of ISUP (ISDN User Part, ISDNYong Hubufen) to VMSC;

Step 205, VMSC make a call to set up to L-CAAF-n and ask, and L-CAAF-n issues called subscriber B with setup requests, and called subscriber B begins ring;

Step 206, called subscriber B carry out follow-up conversation procedure.

As shown in Figure 3, be on session control path, CS territory, IMS user A calls out the traditional mobile subscriber B that inserts from CS, carry out the FB(flow block) of conversation procedure, L-CAAF-n uses the address of ICCF to make a call to ICCF and sets up process, and this process is called the caller process, and flow process is divided following step:

Step 301, CSCF receive the called SIP conversation request message that Calling Side user A initiates to callee side user B; CSCF is routed to the session request TAS that is responsible for Call Forwarding services; The called conversation request message of TAS route is to ICCF;

Step 302, ICCF distribute an ICCF address for user B, and by session control path, CS territory, the conversation request of using USSD will have the ICCF address is issued L-CAAF-n;

After step 303, L-CAAF-n receive conversation request message, immediately called number is used as in the ICCF address, makes a call to set up to ICCF and ask;

Step 304, ICCF respond this conversation request, and send out ALERTING message to L-CAAF-n, and L-CAAF-n and called subscriber B carry out session and set up process, L-CAAF-n advise called subscriber B ring then;

Step 305, called subscriber B carry out follow-up conversation procedure.

In the existing call flow, when IMS user A calls out the traditional mobile subscriber B that inserts from CS and carries out session, can adopt caller process and called process dual mode, if during called subscriber's ring, called subscriber's refusal is answered, need this moment to realize the User Determined User Busy Call Forwarding services, also do not have related procedure to realize this supplementary service at present.

Summary of the invention

Technical problem solved by the invention is to provide the method that realizes user busy call forward in a kind of IMS centralized control business, when the traditional mobile subscriber who inserts from CS when the IMS customer call carries out session, no matter adopt caller process or called process, all can realize the User Determined User Busy Call Forwarding services.

In order to address the above problem, the invention provides the method that realizes user busy call forward in a kind of IMS centralized control business, be applied to the IMS customer call and carry out it is characterized in that the session from traditional mobile subscriber that circuit domain inserts, may further comprise the steps:

(1) calling subscriber is to called subscriber's request of making a call, and sets up the circuit domain session between the IMS circuit domain control function of called subscriber and IP Multimedia System;

(2) refuse to call out as described called subscriber, this called subscriber inserts adaption function by the local circuit territory, and the busy message of called subscriber's user is issued described IMS circuit domain control function, is transmitted to telecommunication application server by this IMS circuit domain control function again;

(3) described telecommunication application server is initiated the user busy call forward business.

Method of the present invention wherein, also comprises:

(4) discharge the media resource and the session of having set up between described called subscriber and the IMS circuit domain control function.

Method of the present invention, wherein, the circuit domain session in the described step (1) between called subscriber and the IMS circuit domain control function is set up, and is initiated or the initiation of local circuit territory access adaption function by described IMS circuit domain control function.

Method of the present invention, wherein, in the described step (2), when using circuit domain session control path passage, adaption function is inserted on circuit domain session control path in described local circuit territory, use unstructured supplementary service data to carry User Determined User Busy message, the busy message of called subscriber's user is directly issued described IMS circuit domain control function;

Wherein, in the described step (2), when using circuit domain session control path passage, after described IMS circuit domain control function is received the busy message of called subscriber's user, be the busy message informing telecommunication application servers of session initiation protocol SIP 486 users with this message conversion.

Method of the present invention, wherein, in the described step (2), when not using circuit domain session control path passage, described local circuit territory is inserted the on-hook forwards that adaption function will carry called subscriber's User Determined User Busy cause value and is given Visited Mobile Switching Center, described Visited Mobile Switching Center by MGCF with the busy described IMS circuit domain control function of message informing of called subscriber's user;

Wherein, in the described step (2), when not using circuit domain session control path passage, described MGCF will be converted into the busy message of session initiation protocol SIP 486 users from the release message that carries the busy cause value of user of described Visited Mobile Switching Center, and with this message informing IMS circuit domain control function.

Said method, wherein, when using circuit domain session control path passage, described media resource method for releasing is, be discharged into described local circuit territory during called subscriber's on-hook and insert the media resource of adaption function, described local circuit territory is inserted adaption function and is sent the busy message of user by unstructured supplementary service data to described IMS circuit domain control function, after while or time-delay a period of time to this IMS circuit domain control function receive the busy message of user, insert adaption function by described local circuit territory again and initiatively initiate the media resource dispose procedure;

Wherein, when using circuit domain session control path passage, described media resource method for releasing is, be discharged into described local circuit territory during called subscriber's on-hook and insert the media resource of adaption function, described local circuit territory insert adaption function by unstructured supplementary service data after described IMS circuit domain control function sends the busy message of user, this IMS circuit domain control function is by unstructured supplementary service data loopback acknowledge message, notify described local circuit territory to insert adaption function and can discharge resource, described local circuit territory is inserted adaption function and is initiatively initiated the media resource dispose procedure at this moment;

Wherein, when using circuit domain session control path passage, described media resource method for releasing is, be discharged into described local circuit territory during called subscriber's on-hook and insert the media resource of adaption function, after described IMS circuit domain control function sent the busy message of user, this IMS circuit domain control function was initiatively initiated the media resource dispose procedure to described local circuit territory access adaption function by unstructured supplementary service data.

The present invention uses USSD in the passage of session control path, CS territory, or utilize User Determined User Busy cause value in called subscriber's on-hook message when not having session control path, CS territory passage, notify ICCF called subscriber's subscriber busy condition, ICCF reinforms TAS and triggers the user busy call forward operation flow, therefore no matter the calling of called subscriber and ICCF is caller process or called process, can both reliably realize the user determination user busy forward shifting operation flow; The present invention simultaneously gives the method that the media resource set up and session discharge.

Description of drawings

Fig. 1 is the group-network construction schematic diagram of IP Multimedia System IMS centralized control business described in the prior art;

Fig. 2 is in the existing IMS centralized control business, and the FB(flow block) that adopts called process is set up in ICCF and called subscriber's session;

Fig. 3 is in the existing IMS centralized control business, and the FB(flow block) that adopts the caller process is set up in ICCF and called subscriber's session;

Fig. 4 is in the described IMS centralized control of the embodiment of the invention business, realizes the flow chart of the embodiment one of User Determined User Busy Call Forwarding;

Fig. 5 is in the described IMS centralized control of the embodiment of the invention business, realizes the flow chart of the embodiment two of User Determined User Busy Call Forwarding;

Fig. 6 is in the described IMS centralized control of the embodiment of the invention business, realizes the flow chart of the embodiment three of User Determined User Busy Call Forwarding;

Fig. 7 is in the described IMS centralized control of the embodiment of the invention business, realizes the flow chart of the embodiment four of User Determined User Busy Call Forwarding;

Fig. 8 is in the described a kind of IMS centralized control business of the embodiment of the invention, realizes the method flow diagram of user busy call forward.

Embodiment

The present invention provides the method that realizes user's busy forward shifting in a kind of IMS centralized control business here, when the traditional mobile subscriber who inserts from CS when the IMS customer call carries out session, no matter adopt caller process or called process, all can realize the problem of User Determined User Busy Call Forwarding services.Below embodiment is described in detail, but not as a limitation of the invention.

Main innovate point of the present invention is: in IMS centralized control business, when the calling subscriber calls out the non-ICS called subscriber in CS territory, no matter to set up and adopt the caller process still be called process to the session between called subscriber and the ICCF, called subscriber's User Determined User Busy message can be issued ICCF, ICCF notice TAS initiates User Determined User Busy Call Forwarding services process.

The present invention mainly provides in a kind of IMS centralized control business, and the calling subscriber calls out the called subscriber of non-ICS by TAS and ICCF, realizes the method for user determination user busy forward shifting, as shown in Figure 8, comprises the steps:

Step 801, the calling subscriber passes through ICCF, makes a call to set up to the called subscriber and asks, and sets up the CS session between called subscriber UE and the ICCF;

Wherein, session between called subscriber and the ICCF is set up can adopt caller process or called process, the caller process by L-CAAF-n to the ICCF request of making a call, called process by ICCF to called subscriber's request of making a call;

Step 802, the called subscriber refuses to call out, and the on-hook message of carrying the User Determined User Busy cause value is issued L-CAAF-n, and this L-CAAF-n issues described ICCF with User Determined User Busy message, is transmitted to TAS by described ICCF again;

When using session control path, CS territory passage, described L-CAAF-n uses USSD to carry User Determined User Busy message, and directly issues this ICCF on session control path, CS territory; After this ICCF receives called subscriber's User Determined User Busy message, be the busy message informing TAS of SIP 486 users with this message conversion;

When not using session control path, CS territory passage, described L-CAAF-n will carry the on-hook forwards of User Determined User Busy cause value and give VMSC, described VMSC notice MGCF; After this MGCF receives the release message that carries the User Determined User Busy cause value of described VMSC, be translated into the busy message of SIP 486 users, issue TAS through ICCF;

Step 803, described TAS initiates User Determined User Busy Call Forwarding services process;

Step 804 discharges the media resource and the session of having set up between described called subscriber and the ICCF.

Wherein when using session control path, CS territory passage, media resource discharges following mode,

Method one: discharge media resource during described called subscriber's on-hook with described L-CAAF-n, described L-CAAF-n sends User Determined User Busy message by USSD to described ICCF, while or time-delay a period of time, initiatively initiate the media resource dispose procedure by described called subscriber again.

Method two: discharge media resource during described called subscriber's on-hook with described L-CAAF-n, this L-CAAF-n by USSD after described ICCF sends User Determined User Busy message, this ICCF is by USSD loopback acknowledge message, notify described L-CAAF-n can discharge resource, described L-CAAF-n initiatively initiates the media resource dispose procedure at this moment.

Method three: discharge the media resource with described L-CAAF-n during described called subscriber's on-hook, after described ICCF sent User Determined User Busy message, described ICCF initiatively initiated the media resource dispose procedure to this L-CAAF-n by USSD.

Reaching embodiment below more in conjunction with the accompanying drawings is described in detail technical scheme of the present invention.

As shown in Figure 4, be the realization flow of the embodiment of the invention one, adopt session control path, CS territory passage to carry out session control in this flow process, concrete steps are:

Step 401～403, IMS calling subscriber make a call to traditional non-ICS called subscriber B by TAS, CSCF, ICCF, MGCF, VMSC, L-CAAF-n, and user B begins ring;

Called process is seen 201～205 steps, and the caller process is seen 301～304 steps;

Step 404～405, called subscriber B answer because of the reason refusal that the user hurries, and the on-hook message of carrying the User Determined User Busy cause value is issued L-CAAF-n, and discharge media resource; Described L-CAAF-n carries User Determined User Busy message by USSD on session control path, CS territory, this User Determined User Busy message is issued described ICCF;

Step 406, described ICCF generate the busy message of SIP 486 users, and this message is issued described CSCF, and this CSCF is routed to TAS with the busy message of SIP 486 users;

After step 407, described TAS receive SIP 486 message, by Call Forwarding logical triggering User Determined User Busy Call Forwarding services process;

Step 408, described L-CAAF-n in step 405 by USSD after described ICCF sends the busy message of user, through time-delay after a while, delay time is received the busy message of user of USSD to this ICCF, and then send out release message to described VMSC, discharge the media resource of this L-CAAF-n to VMSC;

Called subscriber B adopts time-delay, mainly is to allow described ICCF receive the busy message of user of USSD earlier, knows to turn over journey before will entering the user; If do not delay time, the resource release message of the described L-CAAF-n of possibility arrives described ICCF earlier, can cause calling subscriber and called subscriber's session to be released like this;

Step 409, described VMSC send out ISUP to MGCF and discharge (Release) message, discharge the media resource of VMSC to MGCF;

Step 410, described MGCF produce a SIP CANCEL cancellation message, and SIPCANCEL message is issued described ICCF by described CSCF, discharge called subscriber B to the session between the ICCF.

As shown in Figure 5, be the realization flow of the embodiment of the invention two, adopt session control path, CS territory passage to carry out session control in this flow process; The part different with Fig. 4 embodiment one is the dispose procedure implementation of media resource, and Fig. 4 is that L-CAAF-n initiatively initiates the media resource dispose procedure, and Fig. 5 to be ICCF initiate the media resource dispose procedure.Step 501～507 and 401～407th, one to one, different steps is as follows:

Step 508, described ICCF when TAS transmission SIP 486 users do message, also send SIP CANCEL cancellation message to described MGCF simultaneously in step 506, discharge the session of this ICCF to user B;

Step 509, described MGCF are cancelled message with SIP and are changed the ISUP release message into and send to VMSC, discharge the media resource of described MGCF to VMSC;

Step 510, described VMSC send out release message to L-CAAF-n, discharge the media resource of this VMSC to L-CAAF-n.

As shown in Figure 6, be the realization flow of the embodiment of the invention three, adopt session control path, CS territory passage to carry out session control in this flow process; The part different with Fig. 4 embodiment one also is the dispose procedure implementation of media resource, and Fig. 4 is that described L-CAAF-n uses USSD after described ICCF sends User Determined User Busy message, and time-delay a period of time is initiatively initiated the media resource dispose procedure again; And Fig. 6 is that described L-CAAF-n use USSD is after described ICCF sends User Determined User Busy message, this ICCF re-uses USSD and returns an acknowledge message to described L-CAAF-n, and described L-CAAF-n just can initiate the media resource dispose procedure after receiving acknowledge message immediately.Therefore, step 601～607 and 401～407th, one to one, step 609～611 and 408～410 steps are one to one, different step parts is as follows:

After the busy message of the user that step 608, described ICCF receive in step 605,, use USSD to send out acknowledge message, notify described L-CAAF-n can discharge the media resource of described ICCF to L-CAAF-n to described L-CAAF-n by session control path, CS territory;

Step 609, described L-CAAF-n send out release message to VMSC, discharge the media resource of described L-CAAF-n to VMSC.

As shown in Figure 7, be the realization flow of the embodiment of the invention four, do not use session control path, CS territory passage to carry out session control in this flow process; Explanation is not when using session control path, CS territory passage in this example, and the User Determined User Busy cause value that carries in the time of can utilizing called subscriber's on-hook notifies described ICCF user busy, and described ICCF notice TAS initiates the user busy call forward process;

Step 701, described CSCF receive the called SIP conversation request message that Calling Side user A initiates to callee side user B; Described CSCF is routed to the session request TAS that is responsible for Call Forwarding services; The called conversation request message of described TAS route is to described ICCF;

Step 702, described ICCF obtain the roaming number of user B, and the roaming number of utilization acquisition is routed to described MGCF with calling subscriber's SIP conversation request through described CSCF then;

Step 703, described MGCF send out the initial address message IAM of ISUP to VMSC;

Step 704, described VMSC make a call to set up to L-CAAF-n and ask, and described L-CAAF-n issues called subscriber B with setup requests, and described called subscriber B begins ring;

The reason that step 705, described called subscriber B hurry because of the user is refused this calling, send on-hook message to described L-CAAF-n, and the release cause value of carrying User Determined User Busy UDUB (User DecisionUser Busy), described L-CAAF-n gives VMSC with the on-hook forwards of user B;

Step 706, described VMSC discharge this Session Resources, and send release (Release) message to described MGCF, carry the busy cause value of user in the message;

Step 707, described MGCF produce the busy message of SIP 486 users according to the busy cause value of user, and SIP 486 message are issued CSCF, and described CSCF is to the busy message of ICCF loopback SIP 486 users;

Step 708, described ICCF are to the busy message response message of CSCF loopback SIP 486 users, and described CSCF is routed to TAS with the busy message of SIP 486 users;

Step 709, described TAS are by Call Forwarding logical triggering User Determined User Busy Call Forwarding process.

The present invention is by the explanation of the foregoing description, in the passage of session control path, CS territory, use USSD, or utilize User Determined User Busy cause value in called subscriber's on-hook message when not having session control path, CS territory passage, notify ICCF called subscriber's User Determined User Busy state, ICCF reinforms TAS and triggers the user busy call forward operation flow, therefore no matter the calling of called subscriber and ICCF is caller process or called process, can both reliably realize User Determined User Busy Call Forwarding services flow process; The present invention simultaneously gives the method that the media resource set up and session discharge.

Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims

1, realize the method for user busy call forward in a kind of IMS centralized control business, be applied to the IMS customer call and carry out it is characterized in that the session, may further comprise the steps from traditional mobile subscriber that circuit domain inserts:

2, the method for claim 1 is characterized in that, also comprises:

3, the method for claim 1 is characterized in that, the circuit domain session in the described step (1) between called subscriber and the IMS circuit domain control function is set up, and is initiated or the initiation of local circuit territory access adaption function by described IMS circuit domain control function.

4, the method for claim 1, it is characterized in that, in the described step (2), when using circuit domain session control path passage, adaption function is inserted on circuit domain session control path in described local circuit territory, use unstructured supplementary service data to carry User Determined User Busy message, the busy message of called subscriber's user is directly issued described IMS circuit domain control function.

5, method as claimed in claim 4, it is characterized in that, in the described step (2), when using circuit domain session control path passage, after described IMS circuit domain control function is received the busy message of called subscriber's user, be the busy message informing telecommunication application servers of session initiation protocol SIP 486 users with this message conversion.

6, the method for claim 1, it is characterized in that, in the described step (2), when not using circuit domain session control path passage, described local circuit territory is inserted the on-hook forwards that adaption function will carry called subscriber's User Determined User Busy cause value and is given Visited Mobile Switching Center, described Visited Mobile Switching Center by MGCF with the busy described IMS circuit domain control function of message informing of called subscriber's user.

7, method as claimed in claim 6, it is characterized in that, in the described step (2), when not using circuit domain session control path passage, described MGCF will be converted into the busy message of session initiation protocol SIP486 user from the release message that carries the busy cause value of user of described Visited Mobile Switching Center, and with this message informing IMS circuit domain control function.

8, method as claimed in claim 2, it is characterized in that, when using circuit domain session control path passage, described media resource method for releasing is, be discharged into described local circuit territory during called subscriber's on-hook and insert the media resource of adaption function, described local circuit territory is inserted adaption function and is sent the busy message of user by unstructured supplementary service data to described IMS circuit domain control function, after while or time-delay a period of time to this IMS circuit domain control function receive the busy message of user, insert adaption function by described local circuit territory again and initiatively initiate the media resource dispose procedure.

9, method as claimed in claim 2, it is characterized in that, when using circuit domain session control path passage, described media resource method for releasing is, be discharged into described local circuit territory during called subscriber's on-hook and insert the media resource of adaption function, described local circuit territory insert adaption function by unstructured supplementary service data after described IMS circuit domain control function sends the busy message of user, this IMS circuit domain control function is by unstructured supplementary service data loopback acknowledge message, notify described local circuit territory to insert adaption function and can discharge resource, described local circuit territory is inserted adaption function and is initiatively initiated the media resource dispose procedure at this moment.

10, method as claimed in claim 2, it is characterized in that, when using circuit domain session control path passage, described media resource method for releasing is, be discharged into described local circuit territory during called subscriber's on-hook and insert the media resource of adaption function, after described IMS circuit domain control function sent the busy message of user, this IMS circuit domain control function was initiatively initiated the media resource dispose procedure to described local circuit territory access adaption function by unstructured supplementary service data.