METHOD FOR TRIGGERING SELF-EXCHANGE IN INTERNET PROTOCOL MULTIMEDIA SUBSYSTEM ARCHITECTURE, APPARATUS AND SYSTEM THEREOF

The present invention relates to a method for triggering self-exchange in internet protocol multimedia subsystem (IMS) architecture, the method comprising: sending a user registering message to an interrogating call session control function (I-CSCF) by an access gateway control function (AGCF). An identifier is carried by the registering message, for indicating the self-exchange capacity supported by the AGCF. A registering failure response message sent by the I-CSCF is received, and self-exchange is triggered according to the identifier for indicating self-exchange triggering in the registering failure response message. Accordingly, an apparatus and system for self-exchange in IMS architecture is provided by the present invention. The problem of being incapable of triggering self-exchange by the AGCF is resolved, after the user registering failure, and the stability of the system is enhanced. La présente invention concerne un procédé destiné au déclenchement d'auto-échange au sein d'une architecture de sous-