Patent ID: 7756541

Claim:
A method for distributing media data in PoC (push-to-talk over cellular) applied to a PoC system, the PoC system comprises a plurality of clients, a controlling server and a first participating server, wherein the first participating server comprises a plurality of media receiving ports and the media data received by the media receiving ports is delivered to the clients managed by the first participating server; the method comprising the following steps: sending a request to establish a communication group from the controlling server; receiving responses of agreeing with the request at the controlling server; sending a message from the controlling server to the first participating server in order to establish a new media receiving port comprising multicasting in the first participating server if at least two clients among all the clients joining the communication group belong to the first participating server and accept the management thereby; and delivering the media data from the controlling server to the new media receiving port in the first participating server when the first participating server is to deliver the media data to the at least two clients among all the clients joining the communication group managed by the first participating server after the controlling server has received the response of having established the new media receiving port comprising multicasting so that the media data received by the new media receiving port comprising multicasting is delivered to the at least two clients among all the clients joining the communication group managed by the first participating server.