Method for implementing inaccessible forwarding of IP multimedia subsystem centralized service consumer
A multimedia subsystem and user technology, applied in the field of communication, can solve the problems of no paging process, unreachable judgment of users, and inability of switches to judge, and achieve the effect of saving CS resources
Active Publication Date: 2008-12-24
ZTE CORP
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Problems solved by technology
[0031] As for the judgment of the inaccessibility of the user, the existing technology is: when the called call is established, a paging is issued to the called terminal, and the called user cannot be paged, and the switch judges
It can be seen from the establishment method of the called process described above that the first method does not have a paging process, and the switch has no way to judge
The second method has a paging process, but the existing technology is limited by the capabilities of the MGCF entity, and the MGCF entity cannot convert the ISUP release message carrying the user unreachable cause value into a SIP response message, so these two methods are not feasible
Method used
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[0049] In order to solve the disadvantages of the traditional technical solutions, the present invention further elaborates a method for realizing unreachable forwarding of centralized service users of the IP multimedia subsystem described in the present invention through the following examples. Limitations on the Invention.
[0050] In the method described in the embodiment of the present invention, after the called request message is sent to the CSCF entity, the CSCF entity sends the called request message to the ICCF entity through the TAS according to the initial filtering criteria; the ICCF entity converts the called request message into a USSD called Request message, the called request message carries the called number information, and transmits the USSD called request message to the VMSC through the HSS; VMSC pages the called party according to the called number, and finds that the user is unreachable, and the VMSC will carry the called number information on the session ...
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The invention discloses a method for realizing call forwarding when a mobile subscriber an IP multimedia subsystem (IMS) centralized service is unreachable, which comprises the following steps: (1) an IMS circuit switched control function (ICCF) entity sends a switched called request message to a visited mobile switch center (VMSC); (2) the VMSC transmits a call to a called subscriber terminal, and sends a mobile application part error response message when finding the subscriber is unreachable; (3) the ICCF entity maps the mobile application part error response message as a session initiation protocol (SIP) response message, and transmits the SIP response message to a telecom application server (TAS); the TAS controls the triggering of the call forwarding service in case the mobile subscriber is unreachable according to a reason value thereof carried by the SIP response message. The method enables the IMS centralized service terminal to realize call forwarding in case the mobile subscriber is unreachable.
Description
technical field [0001] The present invention relates to the communication field, and more specifically relates to a method for realizing unreachable forwarding of IP multimedia subsystem centralized service users. Background technique [0002] IP (Internet Protocol, referred to as IP) multimedia subsystem (IP MultimediaCore Network Subsystem, referred to as IMS) is an IP-based network architecture proposed by the 3rd Generation Partnership Project (3rd Generation Partnership Project, referred to as 3GPP). An open and flexible business environment is constructed to support multimedia applications and provide users with rich multimedia services. [0003] IMS is an IP-based telecommunications network architecture and has nothing to do with access technology, except that it can be used for Packet Switched (PS) access such as GPRS (General Packet Radio Service) and WLAN (Wireless Local Area Network, Wireless Local Area Network). In addition to providing services for incoming net...
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IPC IPC(8): H04L12/56H04L29/06H04L12/16H04W4/16
Inventor 游世林谢宝国郝振武蔡继燕
Owner ZTE CORP