CN101127957B - Method for terminal user to forward call - Google Patents
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- CN101127957B CN101127957B CN2007101518728A CN200710151872A CN101127957B CN 101127957 B CN101127957 B CN 101127957B CN 2007101518728 A CN2007101518728 A CN 2007101518728A CN 200710151872 A CN200710151872 A CN 200710151872A CN 101127957 B CN101127957 B CN 101127957B
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Abstract
The utility model relates to a method for realizing call forwarding for the end-user, which comprises: as a calling user initiates a call request to a destination user, a domain control function of the destination user and the IP multimedia subsystem circuit are established, namely the circuit domain conversation between the ICCF; as the destination user refuses to call, the user busy information is transferred to a telecommunications application server through an adapter function which is accessed to the local circuit domain, namely L-CAAF-n; for responding the user busy information, the telecommunications application server will initiate the forward shifting process for the user busy information. The SIP session is used in the CS domain session control path, or the user busy reason code is adopted for notifying the user busy state to the ICCF destination user in the session control path without CS domain, and the ICCF informs the TAS to trigger the forward shifting flow for the user busy information, therefore, regardless of the calling between the destination user and the ICCP is the calling process or the called process, which can realize the forward shifting flow for the user busy information reliably, furthermore, the utility model also realizes the established media resources and the session release.
Description
Technical field
The present invention relates to the communications field, particularly, relate to the method that terminal use in IMS (IP Multimedia Core Network Subsystem, IP Multimedia System) the centralized control business realizes Call Forwarding.
Background technology
IP (Internet Protocol, network interconnection agreement) IP multimedia subsystem, IMS---IMS (IP Multimedia Core Network Subsystem) is by third generation partner program (3rd Generation Partnership Project, abbreviate 3GPP as) a kind of IP-based network framework of proposing, 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 (Wireless Local 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 (Circuit Switched is called for short CS) territory, can provide basic speech business and based on the supplementary service of speech business for the user.When IMS was inserted in the CS territory, it developed into a kind of access way, and business provides by IMS is unified fully, and this technology is called IMS centralized control business (IMS Centralized Service), abbreviates ICS as.
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.
Fig. 1 is that legacy user terminals is passed through the Organization Chart that realization IMS centralized control business is inserted in the CS territory, as shown in Figure 1, comprises following network element:
User terminal 101 (User Equipment abbreviates UE as); Adaption function 102 (Local CS Access Adaptation Function-network equivalent is called for short L-CAAF-n) is inserted in the local circuit territory; Visited Mobile Switching Center 103 (Visited Mobile Switch Center abbreviates VMSC as); Home subscriber server 104 (Home Subscriber Server abbreviates HSS as); MGCF 105 (Media Gateway Control Function abbreviates MGCF as); Media gateway 106 (Media Gateway abbreviates MGW as); IMS circuit domain control function 107 (IMS CS Control Function abbreviates ICCF as); CSCF 108 (Call Session Control Function abbreviates CSCF as); Telecommunication application server 109 (Telecom Application Server abbreviates TAS as).
UE 101 sets up 3 paths through the ICCF 107 in L-CAAF-n 102 to IMS territories: session control path, carrying control path and bearer path.Wherein:
The session control path is carried on the CS territory, UE 101 adopts the CS control signaling of standard to insert L-CAAF-n 102, L-CAAF-n 102 adopts session initiation protocol (Session initiation Protocol on the IP bearer path, be called for short SIP) the transmission session control messages, ICCF 107 is inserted through CSCF 108 in this path then.
Carrying control path UE 101 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, and was linked into IMS by MGCF 105 then, arrived ICCF107 by CSCF 108.
Bearer path is that UE 101 is linked into IMS by VMSC 103 and MGW 106, and sets up medium with the remote user equipment of this session and be connected.
The IMS centralized traffic 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 ICCF107 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, (Communication Forwarding Busy calls forwarding on busy, abbreviate CFB as) etc. situation, wherein, busy Network Determined User Busy and two kinds of situations of User Determined User Busy of being divided into again of mobile subscriber.The busy User Status that is meant Network records of network decision is in the conversation as the user for busy; 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, therefore need the attainable flow process of service definition for this reason.
Fig. 2 is on session control path, CS territory, transmits session control signaling by adopt sip message on the IP bearer path, realizes that IMS user A calls out the traditional mobile subscriber B that inserts from CS, carries out the FB(flow block) of conversation procedure.
ICCF utilizes the roaming number of user B to make a call to the called subscriber and sets up process, and this process is called called process, and related procedure can comprise following step:
201, CSCF receives 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 (Telecom Application Server abbreviates TAS as) of being responsible for Call Forwarding services.The called conversation request message of TAS route is to ICCF.
202, ICCF by the IP bearer path, initiates the called request of SIP session to L-CAAF-n on session control path, CS territory, carries calling number and called number in the called request;
203, ICCF obtains 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;
204, MGCF sends out the initial address message (initial address message abbreviates IAM as) of ISUP (ISDN User Part, ISDNYong Hubufen) to VMSC;
205, VMSC makes a call to set up to L-CAAF-n and asks, and L-CAAF-n issues user B with setup requests, and user B begins ring;
206, user B carries out follow-up conversation procedure.
Fig. 3 is on session control path, CS territory, transmits session control signaling by adopt sip message on the IP bearer path, realizes that IMS user A calls out the traditional mobile subscriber B that inserts from CS, carries out the flow chart 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 related procedure can comprise following step:
301, CSCF receives the called SIP conversation request message that Calling Side user A initiates to callee side user B.CSCF is routed to the TAS that is responsible for Call Forwarding services with the session request, and the called conversation request message of TAS route is to ICCF;
302, ICCF distributes an ICCF address for user B, on session control path, CS territory, by the IP bearer path, initiates the called request of SIP session to L-CAAF-n, carries the ICCF address in the request message;
303, after L-CAAF-n receives conversation request message, immediately called number is used as in the ICCF address, makes a call to set up to ICCF and ask;
304, ICCF responds this conversation request, and sends out ALERTING message to L-CAAF-n, and L-CAAF-n and user B carry out session and set up process, and L-CAAF-n notifies user B ring then;
305, user B carries out follow-up conversation procedure;
In the existing call flow, on session control path, CS territory, when when on the IP bearer path, using sip message to transmit session control signaling, 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, during as if 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 this flow process to realize this supplementary service at present.
Summary of the invention
Consider the problems referred to above that exist in the correlation technique and propose the present invention that for this reason, the present invention aims to provide a kind of IMS of being used for centralized control business and realizes that the terminal use determines the method for user busy call forward.
According to the present invention, the method that provides a kind of terminal use to realize Call Forwarding is used for IP Multimedia System centralized control business.This method comprises following processing: the calling subscriber is to called subscriber's request of making a call, and sets up called subscriber and IP Multimedia System circuit domain control function and be the circuit domain session between the ICCF; The called subscriber refuses to call out, and inserting adaption function by the local circuit territory is that L-CAAF-n will be forwarded to telecommunication application server via ICCF by the busy message of session initiation protocol 486 users that the User Determined User Busy message transformation obtains; In response to the busy message of session initiation protocol 486 users, telecommunication application server is initiated the user determination user busy forward shifting process.
Wherein, in said method, the circuit domain session between called subscriber and the ICCF is set up can ICCF or L-CAAF-n initiation.
In addition, the IP carrying is adopted in the session control path of circuit domain session, adopts session initiation protocol to transmit session control signaling on the session control path.
Above-mentioned User Determined User Busy message is meant the message of having carried the User Determined User Busy cause value.
Under the situation of using circuit domain session control path, L-CAAF-n with carrying of called subscriber the on-hook message transformation of User Determined User Busy cause value be the busy message of session initiation protocol 486 users, and be that CSCF is forwarded to ICCF via CSCF with the busy message of session initiation protocol 486 users; Wherein, VMSC is specially to the processing of ICCF the User Determined User Busy forwards via MGCF: VMSC is the release message that has carried the User Determined User Busy cause value with the on-hook message transformation, and release message sent to MGCF, MGCF is converted into the busy message of session initiation protocol 486 users with release message, and the busy forwards of session initiation protocol 486 users is delivered to ICCF.
Said method may further include following processing: discharge the media resource and the session of having set up between called subscriber and the ICCF.
Particularly, can discharge media resource by following operation: the media resource that is discharged into L-CAAF-n during called subscriber's on-hook, L-CAAF-n sends the busy message of session initiation protocol 486 users to ICCF, and notice ICCF user is busy, and L-CAAF-n initiatively initiates the media resource dispose procedure.L-CAAF-n can perhaps after ICCF receives the busy message of session initiation protocol 486 users, initiate the media resource dispose procedure when sending the busy message of session initiation protocol 486 users.
Perhaps, also can discharge media resource: the media resource that is discharged into L-CAAF-n during called subscriber's on-hook by following operation, L-CAAF-n sends the busy message of session initiation protocol 486 users to ICCF, notice ICCF user is busy, ICCF initiatively initiates the media resource dispose procedure after receiving the busy message of session initiation protocol 486 users.
By the present invention, in session control path, CS territory, use the SIP conversation message, perhaps when session control path, no CS territory, utilize the User Determined User Busy cause value, notify ICCF called subscriber's User Determined User Busy state, ICCF reinforms TAS and triggers the user determination user busy forward shifting flow process, 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 flow process, and the present invention has also realized the media resource set up and the release of session.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the group-network construction schematic diagram according to the IMS centralized control business of correlation technique;
Fig. 2 is in the IMS centralized control business according to correlation technique, and the user determination user busy forward shifting flow chart that adopts called process is set up in ICCF and called subscriber's session;
Fig. 3 is in the IMS centralized control business according to correlation technique, and the user determination user busy forward shifting flow chart that adopts the caller process is set up in ICCF and called subscriber's session;
Fig. 4 is a flow chart of realizing the method for Call Forwarding according to the terminal use of the embodiment of the invention;
Fig. 5 is the flow chart of the example 1 of method shown in Figure 4;
Fig. 6 is the flow chart of the example 2 of method shown in Figure 4;
Fig. 7 is the flow chart of the example 3 of method shown in Figure 4.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
The embodiment of the invention provides in a kind of IMS centralized control business, and the calling subscriber realizes User Determined User Busy (User Decision User Busy, the UDUB) method of preceding commentaries on classics by the called subscriber that TAS and ICCF call out non-ICS.
As shown in Figure 4, realize that according to the user terminal of the embodiment of the invention method of Call Forwarding can comprise following processing:
Step S402, calling subscriber set up the circuit domain session between called subscriber and the ICCF (IP Multimedia System circuit domain control function) to called subscriber's request of making a call;
In this process, session between called subscriber and the ICCF is set up can adopt caller process or called process, calling procedure by L-CAAF-n to the ICCF request of making a call, called flow by ICCF to called subscriber's request of making a call;
Step S404, called subscriber refuse to call out, and by L-CAAF-n (adaption function is inserted in the local circuit territory) User Determined User Busy message (that is, having carried the message of User Determined User Busy cause value) are forwarded to telecommunication application server (TAS) via ICCF;
Step S406, in response to User Determined User Busy message, TAS initiates the user determination user busy forward shifting process.
Wherein, the IP carrying is adopted in the session control path of circuit domain session, adopts session initiation protocol to transmit session control signaling on the session control path.
On the one hand, in step S404, under the situation of using session control path, CS territory, L-CAAF-n with carrying of called subscriber the on-hook message transformation of User Determined User Busy cause value be the busy message of SIP 486 users, and the busy message of SIP 486 users is forwarded to ICCF via CSCF (CSCF).
On the other hand, in step S404, under the situation of not using circuit domain session control path, L-CAAF-n with carrying of called subscriber the on-hook forwards of User Determined User Busy cause value give VMSC (Visited Mobile Switching Center), VMSC gives ICCF via MGCF (MGCF) with the User Determined User Busy forwards.
Particularly, VMSC is specially to the processing of ICCF the User Determined User Busy forwards via MGCF: VMSC is the release message that has carried the User Determined User Busy cause value with the on-hook message transformation, and release message sent to MGCF, MGCF is converted into the busy message of SIP 486 users with release message, and the busy forwards of SIP 486 users is delivered to ICCF.
Preferably, said method may further include following processing: discharge media resource and the session (not shown) set up between called subscriber and the ICCF.
Particularly, can discharge media resource by following dual mode:
Mode one: the media resource that is discharged into L-CAAF-n during called subscriber's on-hook, L-CAAF-n sends the busy message of SIP 486 users to ICCF, and notice ICCF user is busy, preferably, after ICCF received the busy message of SIP 486 users, L-CAAF-n initiatively initiated the media resource dispose procedure.
Mode two: be discharged into the media resource of L-CAAF-n during called subscriber's on-hook, L-CAAF-n sends the busy message of SIP 486 users to ICCF, and notice ICCF user is busy, and ICCF initiatively initiates the media resource dispose procedure after receiving the busy message of SIP 486 users.
Below in conjunction with accompanying drawing and example embodiments of the invention are described in detail.
Example one
Fig. 5 shows the realization flow of example one of the present invention, wherein, adopts sip message to carry out session control on session control path, CS territory.As shown in Figure 5, specifically comprise:
501～503, IMS calling subscriber makes 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 step 201～205 among Fig. 2, and the caller process is seen step 301～304 among Fig. 3);
504, user B answers 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;
505, L-CAAF-n is the busy message of SIP 486 users with this on-hook message transformation, and on session control path, CS territory, by the IP bearer path the busy message of SIP 486 users is issued ICCF by CSCF;
506, ICCF is routed to TAS with the busy message of SIP 486 users through CSCF;
507, after TAS receives SIP 486 message, by Call Forwarding logical triggering User Determined User Busy Call Forwarding process;
508, after L-CAAF-n sent the busy message of SIP 486 users in step 505, through time-delay after a while, delay time was received SIP 486 message to ICCF, and then sends out release message to VMSC, discharges the media resource of L-CAAF-n to VMSC;
L-CAAF-n adopts time-delay, mainly is to allow ICCF receive the SIP 486 users message of doing earlier, knows to enter the Call Forwarding process.If do not delay time, the resource release message of possible L-CAAF-n arrives ICCF earlier, can cause calling subscriber and called subscriber's session to be released like this.
509, VMSC sends out ISUP release (Release) message to MGCF, discharges the media resource of VMSC to MGCF;
510, MGCF produces a SIP CANCEL cancellation message, and with SIP
CANCEL is issued ICCF by CSCF, discharges user B to the session between the ICCF.
Example two
Fig. 6 shows the realization flow of example two of the present invention, wherein, adopts sip message to carry out session control on the passage of session control path, CS territory.Be the dispose procedure implementation of media resource with the difference of Fig. 5 example one, Fig. 5 is that L-CAAF-n initiatively initiates the media resource dispose procedure, and Fig. 6 to be ICCF initiate the media resource dispose procedure.601～607 and 501～507 steps are one to one, and different steps is as follows:
608, ICCF when TAS transmission SIP 486 users do message, also sends SIP CANCEL cancellation message to MGCF simultaneously in step 606, and release ICCF is to the session of user B;
609, MGCF sends to VMSC with the release message that SIP CANCEL cancellation message changes ISUP into, discharges the media resource of MGCF to VMSC;
610, VMSC sends out release message to L-CAAF-n, discharges the media resource of VMSC to L-CAAF-n.
Example three
Fig. 7 shows the realization flow of example three of the present invention, wherein, does not use session control path, CS territory passage to carry out session control.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 ICCF user busy, and ICCF notice TAS initiates the user busy call forward process.As shown in Figure 7, can comprise following processing:
701, CSCF receives the called SIP conversation request message that Calling Side user A initiates to callee side user B, and CSCF is routed to the TAS that is responsible for Call Forwarding services with the session request, and the called conversation request message of TAS route is to ICCF;
702, ICCF obtains 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;
703, MGCF sends out the initial address message IAM of ISUP to VMSC;
704, VMSC makes a call to set up to L-CAAF-n and asks, and L-CAAF-n issues user B with setup requests, and user B begins ring;
705, the user B reason of hurrying because of the user is refused this calling, sends on-hook message to L-CAAF-n, and the release cause value of carrying User Determined User Busy.L-CAAF-n gives VMSC with the on-hook forwards of user B;
706, VMSC discharges this Session Resources, and sends release (Release) message to MGCF, carries the busy cause value of user in the message;
707, MGCF produces the busy message of SIP 486 users according to the busy cause value of user, and SIP 486 message are issued CSCF, and CSCF issues ICCF with the busy message of SIP 486 users;
708, ICCF is to the busy message response message of CSCF loopback SIP 486 users, and CSCF is routed to TAS with the busy message of SIP 486 users;
709, TAS is by Call Forwarding logical triggering User Determined User Busy Call Forwarding process.
By the present invention, in session control path, CS territory, use the SIP conversation message, perhaps when session control path, no CS territory, utilize the User Determined User Busy cause value, notify ICCF called subscriber's User Determined User Busy state, ICCF reinforms TAS and triggers the user determination user busy forward shifting flow process, 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 flow process, and the present invention has also realized the media resource set up and the release of session.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a terminal use realizes the method for Call Forwarding, is used for IP Multimedia System centralized control business, it is characterized in that, comprising:
The calling subscriber is to called subscriber's request of making a call, and sets up called subscriber and IP Multimedia System circuit domain control function and be the circuit domain session between the ICCF;
Described called subscriber refuses to call out, and inserting adaption function by the local circuit territory is that L-CAAF-n will be forwarded to telecommunication application server via described ICCF by the busy message of session initiation protocol 486 users that the User Determined User Busy message transformation obtains;
In response to the busy message of described session initiation protocol 486 users, described telecommunication application server is initiated the user determination user busy forward shifting process.
2. method according to claim 1 is characterized in that, the circuit domain session between described called subscriber and the described ICCF is set up and can be initiated by described ICCF or described L-CAAF-n.
3. method according to claim 1 is characterized in that, the IP carrying is adopted in the session control path of described circuit domain session, adopts session initiation protocol to transmit session control signaling on the session control path.
4. method according to claim 1 is characterized in that, described User Determined User Busy message is meant the message of having carried the User Determined User Busy cause value.
5. method according to claim 4, it is characterized in that, under the situation of using circuit domain session control path, described L-CAAF-n with carrying of described called subscriber the on-hook message transformation of User Determined User Busy cause value be the busy message of session initiation protocol 486 users, and be that CSCF is forwarded to described ICCF via CSCF with the busy message of described session initiation protocol 486 users.
6. method according to claim 4, it is characterized in that, under the situation of not using circuit domain session control path, described L-CAAF-n with carrying of described called subscriber the on-hook forwards of User Determined User Busy cause value be VMSC to Visited Mobile Switching Center, VMSC is that MGCF gives described ICCF with described User Determined User Busy forwards via MGCF;
Wherein, described VMSC is specially to the processing of described ICCF described User Determined User Busy forwards via described MGCF: described VMSC is the release message that has carried the User Determined User Busy cause value with described on-hook message transformation, and described release message sent to described MGCF, described MGCF is converted into the busy message of session initiation protocol 486 users with described release message, and the busy forwards of described session initiation protocol 486 users is delivered to described ICCF.
7. according to each described method in the claim 1 to 6, it is characterized in that, further comprise:
Discharge the media resource and the session of having set up between described called subscriber and the described ICCF.
8. method according to claim 7 is characterized in that, discharges media resource by following operation:
Be discharged into the media resource of described L-CAAF-n during described called subscriber's on-hook, described L-CAAF-n sends the busy message of session initiation protocol 486 users to described ICCF, notify described ICCF user busy, and described L-CAAF-n initiatively initiate the media resource dispose procedure.
9. method according to claim 8, it is characterized in that, described L-CAAF-n perhaps after described ICCF receives the busy message of described session initiation protocol 486 users, initiates the media resource dispose procedure when sending the busy message of described session initiation protocol 486 users.
10. method according to claim 7 is characterized in that, discharges media resource by following operation:
Be discharged into the media resource of described L-CAAF-n during described called subscriber's on-hook, described L-CAAF-n sends the busy message of session initiation protocol 486 users to described ICCF, notify described ICCF user busy, described ICCF initiatively initiates the media resource dispose procedure after receiving the busy message of described session initiation protocol 486 users.
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| CN2007101518728A CN101127957B (en) | 2007-09-25 | 2007-09-25 | Method for terminal user to forward call |
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| CN2007101518728A CN101127957B (en) | 2007-09-25 | 2007-09-25 | Method for terminal user to forward call |
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| CN101127957B true CN101127957B (en) | 2011-08-24 |
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| CN101635901B (en) * | 2008-07-21 | 2012-06-06 | 中兴通讯股份有限公司 | SIP terminal with call forwarding function and call forwarding method thereof |
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| KR20050073116A (en) * | 2004-01-08 | 2005-07-13 | 삼성전자주식회사 | The method for automatic call transfer to busy line |
| CN1812601A (en) * | 2005-01-24 | 2006-08-02 | 华为技术有限公司 | Method for realizing IP multi media sub-system conversation falling to circuit switching call |
| CN1874543A (en) * | 2005-10-22 | 2006-12-06 | 华为技术有限公司 | System and method for traditional mobile terminal to access domain of multimedia |
| CN1925525A (en) * | 2005-09-01 | 2007-03-07 | 华为技术有限公司 | Method for realizing bridged collection of IP multimedia subsystem |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050073116A (en) * | 2004-01-08 | 2005-07-13 | 삼성전자주식회사 | The method for automatic call transfer to busy line |
| CN1812601A (en) * | 2005-01-24 | 2006-08-02 | 华为技术有限公司 | Method for realizing IP multi media sub-system conversation falling to circuit switching call |
| CN1925525A (en) * | 2005-09-01 | 2007-03-07 | 华为技术有限公司 | Method for realizing bridged collection of IP multimedia subsystem |
| CN1874543A (en) * | 2005-10-22 | 2006-12-06 | 华为技术有限公司 | System and method for traditional mobile terminal to access domain of multimedia |
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