Abstract: A method for implementing Customized Ringing Signal (CRS) services is provided. The method includes: receiving a call request initiated by a caller terminal; obtaining a policy of playing a CRS tone according to the call request, where the policy is a policy of playing a CRS tone, namely, a caller CRS tone or a callee CRS tone, or a policy of filtering the CRS tone; and playing the CRS tone to a callee according to the policy. By setting a policy of playing the CRS tone to the callee in the network or the callee terminal, the users enjoy the CRS services at their own discretion.

Abstract: A method for video sharing, which realizes video sharing between an originating UE and a terminating UE when the terminating UE is not IMS core network registered. The method includes the following steps: an originating UE sends a video sharing request containing a URI of callee to an application server; the application server determines that the terminating UE of the callee is not IMS core network registered and notifies the terminating UE to register; the terminating UE activates a GPRS connection and registers with the IMS core network; the originating UE and the registered terminating UE set up a sharing session via the application server; the originating UE and the terminating UE share video information. A system and apparatus for practicing this method is also disclosed.