Patent ID: 7953072

Claim:
A method for call termination anchoring of circuit switched domain, used for the anchoring desired by a switching of a circuit switching domain network and an IP multimedia subsystem network, wherein the circuit switched domain network at least includes a mobile switching center and a home location register, and the IP multimedia subsystem network at least includes a voice call continuity application server and a media gateway control function, wherein the method comprises: Step 1, when a call of a circuit switch domain network reaches the mobile switching center of the home circuit switched domain of a voice call continuity subscriber, the mobile switching center sends a LOCREQ (location request) message to the home location register to query location; Step 2, the home location register directly sends a message to the voice call continuity application server to request routing information; Step A performed at the home location register between the Step 1 and the step 2, judges whether the anchoring is necessary; and wherein if it is judged that the anchoring is necessary in the Step A, then perform the Step 2, while if it is judged that the anchoring is unnecessary in the Step A, sends a LOCRES (location request response) message to the mobile switching center that serves the subscriber to query routing; and Step 3, the voice call continuity application server returns IP multimedia subsystem routing number information associated with the voice call continuity application server to the home location register to make the call can be anchored to the voice call continuity application server if the anchoring is necessary.