Patent ID: 8150334

Claim:
A method for use in a push to talk over cellular service, said method comprising the steps of: receiving at a server, a first message from a first terminal indicating for at least one media type supported by the first terminal, defined circumstances under which the first terminal will bar the at least one supported media type in a push to talk type session, even though the first terminal is capable of supporting the given media type; receiving at the server, a second message from a second terminal inviting the first terminal to establish a push to talk type session, the second message including a list of media types that the second terminal proposes to send to the first terminal during the session; in response to receipt of the message from the second terminal, comparing by the server, the list of proposed media types received from the second terminal with the at least one media type supported by the first terminal, and comparing current circumstances with the defined circumstances received from the first terminal to eliminate any proposed media types that are supported by the first terminal but are barred by the first terminal under the current circumstances; and sending a third message with the list of proposed media types from the server to the first terminal if at least one proposed media type is supported and not barred by the first terminal under the current circumstances.