A method for realizing session communication between the calling party and the called party

The present invention discloses a method for realizing a master-called establishment of a session communication, and is applied to a next-generation network. The method comprises the following steps: after the called party is off-hook, the method comprises: re-performing the media negotiation from the called application server to obtain the called media description information, and through the softswitch at all levels to the application where the caller is located The server sends an update request message carrying the called media description information; the application server where the calling party is using the called media description information re-negotiates with the caller; the caller performs the media update and returns the media carrying the calling A response message describing the information to the called party, to achieve the caller and the called two-way media negotiation, to establish a call. The method of the invention can realize multi-service nesting triggering or multiple process forward triggering within a service and ensure that the calling and final calls are normally connected.