Patent ID: 7991898

Claim:
A method of processing session based communications, the method comprising: transmitting, by the terminal, a PUBLISH message to a server in a network to inform whether the terminal supports simultaneous PT (Push-to) sessions, the PUBLISH message being used by the server to determine whether to operate in a B2BUA (Back-to-Back User Agent) mode, and including a value set to active for indicating that the terminal supports simultaneous PT sessions or set to not active for indicating that the terminal does not support simultaneous PT sessions; receiving, by the terminal, a response message from the server in response to the PUBLISH message; establishing, by the terminal based on the response message, a PT session with the server which has determined to operate in the B2BUA mode based on the value of the PUBLISH message and based on an indication that the server supports the simultaneous PT sessions; and sending, by the terminal via the established PT session, RTP data, RTCP data, or TBCP data to the server that operates in the B2BUA mode.