Method and system for implementing IMS centralized service final call
An implementation method and call termination technology, applied in the communication field, can solve the problems of long call setup time and affect the calling user experience, and achieve the effects of shortening the setup time, shortening the call setup time, and improving the experience.
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[0108] The technical solutions of the present invention will be further described in more detail in conjunction with the accompanying drawings and specific embodiments.
[0109] As shown in FIG. 4 , it is a flow chart of the ICS termination service in which the session control path is in the PS domain in the embodiment of the present invention.
[0110] In Fig. 4, when the session control path is in the PS domain, method 1 in the implementation mode can adopt the way of ICCF PSI (Public Service Identities, public service identification) number identification, when the call establishment request on the bearer control path precedes When the session establishment request on the session control path reaches the terminal user, the terminal user checks whether the calling number in the call information is the ICCF PSI number. If it is the ICCF PSI number, it indicates that the ICS call is initiated by ICCF as a B2BUA. Therefore, the terminal The user needs to wait for the session es...
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