CN101115237A - Method for performing call deflexion in IP multimedia subsystem centralized control service - Google Patents
Method for performing call deflexion in IP multimedia subsystem centralized control service Download PDFInfo
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- CN101115237A CN101115237A CNA2007101457160A CN200710145716A CN101115237A CN 101115237 A CN101115237 A CN 101115237A CN A2007101457160 A CNA2007101457160 A CN A2007101457160A CN 200710145716 A CN200710145716 A CN 200710145716A CN 101115237 A CN101115237 A CN 101115237A
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Abstract
The invention discloses a method of conducting calling deflexion in an IP multimedia subsystem centralized control business center, which comprises a step S102, a called terminal sends delivering messages with deflexion information to a local circuit domain access adaptation function, wherein, the deflexion information carries deflexion numbers; a step S104, according to the delivering messages, the local circuit domain access adaptation function sends a deflexion request to an IP multimedia subsystem circuit domain control function by a conversation control path under a conversation initialization protocol mode, wherein, the deflexion request carries deflexion numbers; a step S106, the IP multimedia subsystem circuit domain control function receives the deflexion request and transmits the deflexion request to a telecommunication application server through a calling conversation control function; and a step S108, the telecommunication application server receives the deflexion request transmitted by the IP multimedia subsystem circuit domain control function, and then carries a calling deflexion according to the deflexion request. By using the invention, non-ICS users can realize calling deflexion businesses in an IMS domain.
Description
Technical field
The present invention relates to the communications field, and especially, relate to a kind of method of in IP Multimedia System centralized control business, carrying out Call Deflexion.
Background technology
IP (network interconnection agreement, Internet Protocol, be called for short IP) IP multimedia subsystem, IMS (IP Multimedia Core Network Subsystem, be called for short IMS) be by third generation partner program (3rd Generation Partnership Project, abbreviation 3GPP) a kind of IP-based network framework that proposes, it has made up open and service environment flexibly, and can support multimedia application, thereby provides 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) (Wireless Local Area Network, WLAN) etc. packet access network provides outside the business, can also be global system for mobile communications (Global System for Mobilecommunications, GSM), (Universal MobileTelecommunications System UMTS) waits mobile cellular network to provide professional to unified mobile communcations system.
Mobile cellular network such as GSM, UMTS adopts circuit-switched technology, is called circuit (Circuit Switched is called for short CS) territory, and it 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 can develop into a kind of access way, and business provides by IMS is unified fully, and this technology is called IMS centralized traffic (IMS Centralized Service is called for short ICS).
The IMS centralized traffic 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.
Fig. 1 is a system architecture diagram of realizing IMS centralized control business.As shown in Figure 1, this business relates to following network element:
User terminal (User Equipment is called for short UE) 101; Adaption function (Local CS Access Adaptation Function-network equivalent is called for short L-CAAF-n) 102 is inserted in the local circuit territory; Visited Mobile Switching Center 103 (Visited Mobile SwitchCenter is called for short VMSC); Home subscriber server 104 (Home Subscriber Server is called for short HSS); MGCF 105 (Media Gateway ControlFunction is called for short MGCF); Media gateway 106 (Media Gateway is called for short MGW); IMS circuit domain control function 107 (IMS CS Control Function is called for short ICCF); CSCF 108 (Cail Session Control Function is called for short CSCF); Telecommunication application server 109 (Telecom Application Server is called for short TAS).
When carrying out the IMS centralized traffic, UE 101 will set up 3 paths via the ICCF 107 in L-CAAF-n 102 to IMS territories: session control path, carrying control path and bearer path, wherein, the SIP signaling method is used in the session control path, and this path arrives ICCF 107 by CSCF108; On carrying control path, UE 101 adopts the CS control signaling of standard to insert VMSC 103 by L-CAAF-n 102, and is linked into IMS by MGCF 105, and arrives ICCF 107 by CSCF 108; At bearer path, UE 101 is linked into IMS by L-CAAF-n 102, 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 will serve as the IMS user agent, replace subscriber equipment to insert IMS.
In addition, can adopt TAS 109 to realize all kinds of telecommunication services, HSS 104 is used to obtain roaming number and leading subscriber data.
The Call Deflexion business is to call out the called number B of the deflection business of having contracted as calling subscriber A, after the B ring, personal inclination according to user B, import a deflection number C, initiate a deflection business, user B tells switch with deflection information, initiates the calling to deflection number C by switch, thereby makes user A and deflection user C conversation.
When Fig. 2 was the IMS customer call from the user that CS inserts, the user who inserts from CS realized the flow chart of Call Deflexion.As shown in Figure 2, concrete processing procedure is as follows:
201, CSCF receives the called SIP conversation request message that Calling Side calling subscriber A initiates to called subscriber B;
202, CSCF is established to the calling of called subscriber B, the B ring according to user B number;
203, after the user terminal B ring, input deflection number C passes to VMSC by release message via L-CAAF-n with deflection information;
204, VMSC finds that according to receiving release message the user has the deflection business, then carries out the Call Deflexion business;
205, VMSC initiates a calling to deflection user C, and calling subscriber A and deflection user C are conversed.
From above processing as can be seen, the Call Deflexion business realizes in the CS territory, and for the ICS business, realize in the IMS territory obviously realizing the Call Deflexion business.
Summary of the invention
Consider the problems referred to above and make the present invention that for this reason, main purpose of the present invention is to provide a kind of scheme of carrying out Call Deflexion in IP Multimedia System centralized control business.
According to embodiments of the invention, a kind of method of carrying out Call Deflexion in IP Multimedia System centralized control business is provided, this method can make non-IMS centralized traffic user realize the business of Call Deflexion in the IMS territory.
This method comprises: the release message that step S102, terminal called will have deflection information is sent to local circuit territory access adaption function, wherein, carries the deflection number in the deflection information;
Step S104, adaption function is inserted according to release message in the local circuit territory, and the deflection request is sent to the IP Multimedia System circuit domain control function via the session control path under the conversation initialized protocol mode, wherein, carries the deflection number in the deflection request;
Step S106, the IP Multimedia System circuit domain control function receives the deflection request, and the deflection request is forwarded to telecommunication application server by CSCF; And
After step S108, telecommunication application server receive the deflection request of being transmitted by the IP Multimedia System circuit domain control function, carry out Call Deflexion according to the deflection request.
Wherein, in step S106, the IP Multimedia System circuit domain control function is forwarded to telecommunication application server with the session initialization protocol message as the deflection request.
In addition, in step S108, when telecommunication application server is carried out Call Deflexion, further carry out following the processing: steps A, change before telecommunication application server notice calling terminal is called out, and telecommunication application server is to the foundation that makes a call of deflection number.
And may further include in steps A: steps A 1, telecommunication application server notification call conversation control function are changeed before calling out; Steps A 2 is changeed before CSCF notice calling terminal is called out; Steps A 3, telecommunication application server is to the call setup of CSCF initiation to the deflection number; And steps A 4, CSCF is transmitted the call setup to the deflection number.
Wherein, in steps A 1, telecommunication application server changes before calling out by SIP 181 message informing CSCFs; In steps A 2, CSCF changes before calling out by SIP 181 message informing calling terminals.
In addition, in the method, after step S104, further comprise: step B discharges the local circuit territory and inserts bearing resource and the session of adaption function to the IP Multimedia System circuit domain control function.
Particularly, in step B, the mode of releasing bearing resource and session comprises:
After the IP Multimedia System circuit domain control function is received the deflection request, the message that discharges session is sent to the local circuit territory inserts adaption function; And
Insert adaption function after the IP Multimedia System circuit domain control function sends the deflection request in the local circuit territory, after certain delay, insert adaption function by the local circuit territory message of releasing bearing resource is sent to the IP Multimedia System circuit domain control function.
In addition, the conversation initialization protocol message of deflection request for representing that calling is temporarily shifted out that adaption function sends inserted in the local circuit territory.And this deflection request is SIP 302 response messages.
By technique scheme of the present invention, can make non-IMS centralized traffic user realize the business of Call Deflexion in the IMS territory.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the block diagram according to the system of the realization ICS business of correlation technique;
Fig. 2 is the signaling process figure according to the Call Deflexion business that realizes in the CS territory of correlation technique;
Fig. 3 is the flow chart that carries out the method for Call Deflexion in IP Multimedia System centralized control business according to the embodiment of the invention;
Fig. 4 is the signaling process figure according to the processing example 1 of the method for carrying out Call Deflexion in IP Multimedia System centralized control business of the embodiment of the invention; And
Fig. 5 is the signaling process figure according to the processing example 2 of the method for carrying out Call Deflexion in IP Multimedia System centralized control business of the embodiment of the invention.
Embodiment
In the present embodiment, a kind of method of carrying out Call Deflexion in IP Multimedia System centralized control business is provided, wherein, the deflection business that UE is carried out inserts the session control path of adaption function (L-CAAF-n) by the PS territory by the local circuit territory Call Deflexion request is carried to IP Multimedia System circuit domain control function (ICCF), replace UE to the deflection that makes a call of IMS territory by ICCF, make non-ICS user realize the business of Call Deflexion in the IMS territory.
When this method of enforcement, at first, after CSCF (CSCF) is received the call request that calling terminal sends over, by telecommunication application server (TAS), ICCF, MGCF (MGCF), Visited Mobile Switching Center (VMSC) and L-CAAF-n to the terminal called foundation that makes a call, dialed terminal bell; The called subscriber imports the deflection number according to the personal inclination to terminal called;
Afterwards, as shown in Figure 3, comprise according to the method for in IP Multimedia System centralized control business (ICS), carrying out Call Deflexion of present embodiment: step S102, the release message that terminal called will have deflection information is sent to L-CAAF-n, wherein, carry the deflection number in the deflection information; Step S104, L-CAAF-n are sent to ICCF with the deflection request via the session control path under conversation initialized protocol (SIP) mode according to release message, wherein, carry the deflection number in the deflection request; Step S106, ICCF receives the deflection request, and the deflection request is forwarded to TAS by CSCF; And step S108, after TAS receives the deflection request of being transmitted by ICCF, carry out Call Deflexion according to the deflection request.
Wherein, in step S102, the sip message that temporarily shifts out is called out in the deflection request that L-CAAF-n sends for expression.And this deflection request is the sip message that identifying call letters temporarily shifts out, and for example, can be SIP 302 response messages.In step S106, ICCF replaces terminal called to initiate deflection, sip message as the deflection request, is forwarded to TAS via CSCF, identifying call letters deflection.
In addition, in step S108, when TAS carries out Call Deflexion, further carry out following the processing: steps A, change before TAS notice calling terminal is called out, and TAS is to the foundation that makes a call of deflection number.
And, in steps A, may further include: steps A 1, before calling out, changes TAS notice CSCF; Steps A 2 is changeed before CSCF notice calling terminal is called out; Steps A 3, TAS is to the call setup of CSCF initiation to the deflection number; And steps A 4, CSCF transmits the call setup to the deflection number.
Wherein, in steps A 1, TAS changes before calling out by SIP 181 message informing CSCF; In steps A 2, CSCF changes before calling out by SIP 181 message informing calling terminals.
In addition, in the method, after step S104, further comprise: step B discharges bearing resource and the session of L-CAAF-n to ICCF.Wherein, step B and step S106 and step S108 are executed in parallel.
Particularly, in step B, the mode of releasing bearing resource and session mainly can comprise following two kinds:
(1) after ICCF receives the deflection request, the message that discharges session is sent to L-CAAF-n via CSCF, MGCF, VMSC, thereby discharges bearing resource and the session of L-CAAF-n to ICCF.Its concrete processing comprises: ICCF to the cancellation message that MGCF sends SIP, goes to discharge the session of ICCF to MGCF by CSCF; MGCF cancels the release message that message changes ISUP (ISUP) into SIP and passes to VMSC, discharges the bearing resource of MGCF to VMSC; VMSC sends out release message to L-CAAF-n, discharges the bearing resource of VMSC to L-CAAF-n;
(2) L-CAAF-n is after ICCF sends the deflection request, after certain delay, by L-CAAF-n the message of releasing bearing resource is sent to ICCF by VMSC, MGCF, CSCF, thereby discharges bearing resource and the session of L-CAAF-n to ICCF.Its concrete processing is as follows: L-CAAF-n through sending out release message to VMSC after one section time-delay, discharges the bearing resource of L-CAAF-n to VMSC after sending out the Call Deflexion request to ICCF; VMSC sends out the ISUP release message to called MGCF, discharges the bearing resource of VMSC to MGCF; MGCF to the cancellation message that ICCF sends out SIP, discharges the session of MGCF to ICCF by CSCF.
At last, after call setup, just realized Call Deflexion.
The system that carries out Call Deflexion in the IP Multimedia System centralized control business of realization said method can comprise: calling terminal, terminal called, L-CAAF-n, ICCF, CSCF and TAS.
When realizing that Call Deflexion is professional, L-CAAF-n is used to receive the release message that terminal called has the deflection request, according to the deflection solicited message in the release message (comprising the deflection number), sends sip message to CSCF, initiates deflection; Initiate or participate in discharging bearing resource and the session of L-CAAF-n to ICCF simultaneously.
CSCF is used to receive the call request of calling terminal, and to the terminal called foundation that makes a call; Also being used to receive changes before the notice calling terminal is just called out after SIP 181 message of TAS; And receive TAS to the deflection number make a call set up after, transmit the call setup that the terminal that deflects into is initiated.
Terminal called is used for after ring, initiates the deflection request according to the deflection number of user input, and deflection information is delivered in the L-CAAF-n deflection request and carried the deflection number at least by discharging conversation message;
ICCF is used to receive the deflection request that L-CAAF-n transmits, and it is transmitted to TAS by CSCF;
TAS is used to receive the deflection request that ICCF transmits, and after reception, change before just calling out with SIP 181 message informing CSCF, and to CSCF to the foundation that makes a call of deflection number.
Further, L-CAAF-n passes to the deflection request of ICCF and calls out the sip message that temporarily shifts out for expression, for example, can be SIP 302 response messages.
Because the solution of the present invention is when carrying out Call Deflexion, do not adopt original CS field technique to carry the method for deflection information in the message of CS, but the deflection request is passed to ICCF by the session path of L-CAAF-n by the SIP mode, replace UE to realize the Call Deflexion business by ICCF again, thereby realized that ICS Call Deflexion business controls in the IMS territory.
Describe the present invention in detail below in conjunction with instantiation.
Fig. 4 and Fig. 5 realize two signaling process figure that handle example of Call Deflexion business for ICS user of the present invention.In these two examples, when calling out called ICS terminal B, a calling terminal A sets up an ICS called service, after the ICS terminal B ring, initiate a deflection business according to user's demand, the deflection number is C.
And, these two examples provide two kinds of different release L-CAAF-n solution to ICCF bearing resource and session, this is in order to solve when called user terminal B is carrying out the deflection business operation, if the release message of called user terminal arrives first ICCF than the deflection message that USSD carries, can whole calling will be moved to end, cause to carry out the problem of deflection business.
These two examples will be described respectively below.
Example 1
In this example, discharging ICCF is after ICCF receives the deflection service request to the bearing resource of L-CAAF-n and the mode of session, initiates to discharge flow process by ICCF.As shown in Figure 4, the concrete processing procedure of this example is as follows:
401, CSCF receives the called SIP conversation request message that Calling Side calling terminal A initiates to terminal called B;
402, CSCF is established to the calling of terminal called B according to terminal called B number, terminal called B ring;
403, terminal called B sends the release message that has the deflection number to L-CAAF-n, discharges bearing resource and the session of terminal called to L-CAAF-n;
404, the message such as deflection number that comprise in the release message of L-CAAF-n according to the terminal called transmission, use the SIP mode to send SIP 302 response messages (expression is called out and temporarily shifted out) that carry the Call Deflexion request to CSCF, CSCF is to ICCF for this Call Deflexion request process;
Step 405 is the flow process of release L-CAAF-n to ICCF bearing resource and session to step 407, and step 408 and step 409 are the call flow to the deflection number, and these two flow processs walk abreast, and all is to begin to carry out after step 404.
Step 405, ICCF handles the Call Deflexion request of receiving, by the cancellation message of CSCF to MGCF transmission SIP, goes to discharge the session of ICCF to MGCF immediately, and execution in step 406;
Step 407, VMSC sends out release message to L-CAAF-n, discharges the bearing resource of VMSC to L-CAAF-n.So far, release L-CAAF-n finishes to the flow process of ICCF bearing resource and session.
Step 408, ICCF handles in the Call Deflexion request of receiving in step 405, and ICCF also transmits SIP 302 message by CSCF to TAS, and expression is called out and is temporarily shifted out; Execution in step 409;
Step 409, TAS carries out the Call Deflexion business, to the call flow end of deflection number;
Wherein, step 409 can specifically be refined as step 410 to step 413:
Step 410, TAS changes before just calling out with SIP 181 message informing CSCF;
Step 411, CSCF changes before just calling out with SIP 181 message informing calling terminal A;
Step 412, TAS to CSCF to the deflection number C foundation that makes a call;
Step 413, CSCF transmits the call setup that deflection number C is initiated.
Example 2
In this example, discharging ICCF is that L-CAAF-n sends the deflection business information behind ICCF to the bearing resource of L-CAAF-n and the mode of session, discharges bearing resource and the session of ICCF to L-CAAF-n through one section time-delay by L-CAAF-n.
As shown in Figure 5, concrete processing procedure is as follows in this example:
Step 501, CSCF receives the called SIP conversation request message that Calling Side calling terminal A initiates to terminal called B;
Step 502, CSCF is established to the calling of terminal called B according to terminal called B number, terminal called B ring;
Step 503, terminal called B sends release message to L-CAAF-n, has the deflection number, and discharges bearing resource and the session of terminal called B to L-CAAF-n.
Step 504, the L-CAAF-n deflection that makes a call uses the SIP mode to carry Call Deflexion request SIP 302 response messages (expression is called out and temporarily shifted out), this Call Deflexion request through CSCF to ICCF;
Step 505, after step 504, when ICCF handled the Call Deflexion request of receiving, ICCF also transmitted SIP 302 message by CSCF to TAS, and expression is called out and is temporarily shifted out, and execution in step 506;
Step 506, TAS carries out the Call Deflexion business, to the call flow end of deflection number;
Wherein, step 506 specifically is refined as step 507 to step 510:
Step 507, TAS changes before just calling out with SIP 181 message informing CSCF;
Step 508, CSCF changes before just calling out with SIP 181 message informing calling terminal A;
Step 509, TAS to CSCF to the deflection number C foundation that makes a call;
Step 510, CSCF transmits the call setup that deflection number C is initiated.
Step 511 after ICCF (via CSCF) sends out the Call Deflexion request, is sent out release message through one section time-delay L-CAAF-n to VMSC in step 504, discharges the bearing resource of L-CAAF-n to VMSC;
Step 513, MGCF to the cancellation message that ICCF sends out SIP, discharges the session of MGCF to ICCF by CSCF; So far, L-CAAF-n finishes to ICCF bearing resource and session release;
And flow process and the flow process of step 511 to 513 of step 505 to 506 is parallel.
In sum, take method of the present invention, use the session control path in PS territory to transmit Call Deflexion information, realized the Call Deflexion business of ICS user terminal.
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 method of carrying out Call Deflexion in IP Multimedia System centralized control business is characterized in that, comprising:
The release message that step S102, terminal called will have deflection information is sent to local circuit territory access adaption function, wherein, carries the deflection number in the described deflection information;
Step S104, adaption function is inserted according to described release message in described local circuit territory, the deflection request is sent to the IP Multimedia System circuit domain control function via the session control path under the conversation initialized protocol mode, wherein, carries described deflection number in the described deflection request;
Step S106, described IP Multimedia System circuit domain control function receives described deflection request, and described deflection request is forwarded to telecommunication application server by CSCF; And
After step S108, described telecommunication application server receive the described deflection request of being transmitted by described IP Multimedia System circuit domain control function, carry out Call Deflexion according to described deflection request.
2. method of in IP Multimedia System centralized control business, carrying out Call Deflexion according to claim 1, it is characterized in that, in described step S106, described IP Multimedia System circuit domain control function is forwarded to described telecommunication application server with the session initialization protocol message as described deflection request.
3. method of in IP Multimedia System centralized control business, carrying out Call Deflexion according to claim 1, it is characterized in that, in described step S108, when described telecommunication application server is carried out described Call Deflexion, further carry out following the processing: steps A, change before described telecommunication application server notice calling terminal is called out, and described telecommunication application server is to the foundation that makes a call of described deflection number.
4. method of carrying out Call Deflexion in IP Multimedia System centralized control business according to claim 3 is characterized in that, further comprises in described steps A:
Steps A 1, described telecommunication application server are changeed before notifying the described calling of described CSCF;
Steps A 2, described CSCF are changeed before notifying the described calling of described calling terminal;
Steps A 3, described telecommunication application server is to the described call setup of described CSCF initiation to described deflection number; And
Steps A 4, described CSCF is transmitted the described call setup to described deflection number.
5. method of in IP Multimedia System centralized control business, carrying out Call Deflexion according to claim 4, it is characterized in that, in described steps A 1, described telecommunication application server changes by the described calling of the described CSCF of SIP 181 message informings is preceding.
6. method of in IP Multimedia System centralized control business, carrying out Call Deflexion according to claim 4, it is characterized in that, in described steps A 2, described CSCF changes by the described calling of the described described calling terminal of SIP 181 message informings is preceding.
7. according to each described method of in IP Multimedia System centralized control business, carrying out Call Deflexion in the claim 1 to 6, it is characterized in that, after described step S104, further comprise:
Step B discharges described local circuit territory and inserts bearing resource and the session of adaption function to described IP Multimedia System circuit domain control function.
8. method of carrying out Call Deflexion in IP Multimedia System centralized control business according to claim 7 is characterized in that, in described step B, the mode that discharges described bearing resource and described session comprises:
After described IP Multimedia System circuit domain control function is received described deflection request, the message that discharges described session is sent to described local circuit territory inserts adaption function; And
Insert adaption function after described IP Multimedia System circuit domain control function sends described deflection request in described local circuit territory, after certain delay, the message that will be discharged described bearing resource by described local circuit territory access adaption function is sent to described IP Multimedia System circuit domain control function.
9. according to each described method of in IP Multimedia System centralized control business, carrying out Call Deflexion in the claim 1 to 6, it is characterized in that the conversation initialization protocol message of described deflection request for representing that calling is temporarily shifted out that adaption function sends inserted in described local circuit territory.
10. according to each described method of in IP Multimedia System centralized control business, carrying out Call Deflexion in the claim 1 to 6, it is characterized in that described deflection request is SIP 302 response messages.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009149635A1 (en) * | 2008-06-13 | 2009-12-17 | 华为技术有限公司 | A method, device and mobile communication system for realizing explicit communication transfer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009149635A1 (en) * | 2008-06-13 | 2009-12-17 | 华为技术有限公司 | A method, device and mobile communication system for realizing explicit communication transfer |
| GB2469610A (en) * | 2008-06-13 | 2010-10-20 | Huawei Tech Co Ltd | A method, device and mobile communication system for realizing explicit communication transfer |
| CN101527894B (en) * | 2008-06-13 | 2010-10-27 | 华为技术有限公司 | Method, equipment and mobile communication system for realizing explicit communication transfer |
| GB2469610B (en) * | 2008-06-13 | 2012-06-06 | Huawei Tech Co Ltd | Method, equipment and mobile communication system for realizing explicit call transfer |
| US8917719B2 (en) | 2008-06-13 | 2014-12-23 | Huawei Technologies Co., Ltd. | Method, equipment and mobile communication system for realizing explicit call transfer |
| US8964729B2 (en) | 2008-06-13 | 2015-02-24 | Huawei Technologies Co., Ltd. | Method, equipment and mobile communication system for realizing explicit call transfer |
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