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Method for terminal user to forward call
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A technology for call forwarding and end users, applied in the field of communication
Inactive Publication Date: 2008-02-20
ZTE CORP
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[0033] In the existing call flow, on the session control path in the CS domain, when the session control signaling is transmitted by using SIP messages on the IP bearer channel, the IMS user A calls the traditional mobile user B accessed from the CS to conduct a session. There are two methods of calling process and called process. If the called user refuses to answer when the called user rings, it is necessary to implement the call forwarding service when the user decides that the user is busy. At present, there is no such process to realize this supplementary service.
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example 1
[0071] Fig. 5 shows the implementation process of Example 1 of the present invention, wherein the session control is performed by using SIP messages on the CS domain session control path. As shown in Figure 5, specifically include:
[0072] 501-503. The IMS calling user initiates a call to the traditional non-ICS called user B through TAS, CSCF, ICCF, MGCF, VMSC, and L-CAAF-n, and user B starts ringing; (the called process is shown in Figure 2 Steps 201~205, the calling process is shown in steps 301~304 in Fig. 3);
[0073] 504. User B refuses to answer the call because the user is busy, sends an on-hook message carrying the value of the user's determination of the user's busy reason to L-CAAF-n, and releases the media resource;
[0074] 505. The L-CAAF-n converts the on-hook message into a SIP 486 user busy message, and sends the SIP 486 user busy message to the ICCF through the CSCF on the CS domain session control path through the IP bearer channel;
[0075] 506. The ICCF...
example 2
[0082]FIG. 6 shows the implementation process of Example 2 of the present invention, wherein, session control is performed by using SIP messages on the CS domain session control path channel. The difference from Example 1 in FIG. 5 lies in the implementation of the media resource release process. In FIG. 5 , the L-CAAF-n initiates the media resource release process, while in FIG. 6 , the ICCF initiates the media resource release process. Steps 601~607 correspond to steps 501~507 one by one, and the different steps are as follows:
[0083] 608. When the ICCF sends a SIP 486 user busy message to the TAS in step 606, it also sends a SIP CANCEL message to the MGCF to release the session from the ICCF to user B;
[0084] 609. The MGCF converts the SIP CANCEL cancel message into an ISUP release message and sends it to the VMSC, releasing the media resources from the MGCF to the VMSC;
[0085] 610. The VMSC sends a release message to the L-CAAF-n to release the media resources from ...
example 3
[0087] FIG. 7 shows the implementation process of Example 3 of the present invention, wherein session control is performed without using the CS domain session control path channel. This example shows that when the CS domain session control path channel is not used, the user-determined user busy reason value carried when the called user hangs up can be used to notify the ICCF that the user is busy, and the ICCF notifies the TAS to initiate the call forwarding process when the user is busy. As shown in Figure 7, the following processing may be included:
[0088] 701. The CSCF receives the called SIP session request message initiated by the calling side user A to the called side user B, the CSCF routes the session request to the TAS responsible for the call forwarding service, and the TAS routes the called session request message to the ICCF;
[0089] 702. The ICCF obtains the roaming number of user B, and then uses the obtained roaming number to route the SIP session request of ...
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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 domaincontrol 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 telecommunicationsapplication server through an adapter function which is accessed to the local circuit domain, namely L-CAAF-n; for responding the user busy information, the telecommunicationsapplication 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.
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