Abstract: The invention discloses a method for establishing a session between a caller and a callee, applying to a next generation network, after said callee picking up, which includes: restarting a session negotiation with said callee via a first application server corresponding to the callee, upon obtaining a session description protocol of said callee, sending an update request message containing a session description protocol of said callee to a second application server corresponding to the caller; renegotiating, by the second application server, session with a caller according to said session description protocol of said callee; after the caller completing session update, returning a response message containing a session description protocol of said caller to said callee. The method can realize the multi-service nesting triggering or the forwarding triggering of several flows in one service, and can guarantee the proper connection between the caller and the callee.

Abstract: A method for implementing Intelligent Call Service, includes: allocating a unique number to a user, storing the unique number and a plurality of terminal numbers bound with the unique number, the user's Presence status and the routing order corresponding to the user's presence status; when the system receives a call for calling the unique number, determining a routing order according to the user's Presence status information corresponding to the unique number; determining corresponding terminal numbers bound with the unique number according to the routing order and issuing the call sequentially or simultaneously to the corresponding terminal numbers. An apparatus for implementing Intelligent Call Service is also disclosed. The embodiments of the present invention integrate the advantages of Presence service and Intelligent Call Routing service, and provide better service to users.

Abstract: The invention discloses a method for establishing a session between a caller and a callee, applying to a next generation network, after said callee picking up, which includes: restarting a session negotiation with said callee via a first application server corresponding to the callee, upon obtaining a session description protocol of said callee, sending an update request message containing a session description protocol of said callee to a second application server corresponding to the caller; renegotiating, by the second application server, session with a caller according to said session description protocol of said callee; after the caller completing session update, returning a response message containing a session description protocol of said caller to said callee. The method can realize the multi-service nesting triggering or the forwarding triggering of several flows in one service, and can guarantee the proper connection between the caller and the callee.

Abstract: The present invention discloses a method for playing audio/video files in a console at a conference in the next generation network. The method includes the following steps: the conference console sends a request for playing the audio/video files to a conference application server; the media resource server determines a media channel between the media resource server and the conference console in accordance with a request sent by the conference application server; the conference console converts a format of media streams of the audio/video files into a format supported by the media resource server, and transfers the converted media streams to the media resource server via the media channel; and the media resource server plays media stream information of the audio/video files to conference terminals. The present invention achieves playing both audio files and video files with an excellent effect, irrespective of whether the local facilities have corresponding functions of playing audio or video files.