METHOD AND SYSTEM FOR ESTABLISHING AD-HOC SESSION IN PUSH TO TALK OVER CELLULAR NETWORK

摘要

A method is provided to establish an ad-hoc PoC group session by causing a PoC client with a pre-established session to use an existing session as a conference server for a group PoC call and by including many individuals and members of at least one PoC group among talk targets. In the method, a session invitation proxy message, which includes session dialog information, entry uniform resource identifiers (URIs), and a Session Initiation Protocol (SIP) message method, is transmitted to an originating PoC server in a state in which the pre-established session is established. The originating PoC server transmits the message based on the SIP message method to a destination address included in the session invitation proxy message. Finally, the ad-hoc session is established between an originating PoC system and the destination address included in the session invitation proxy message.