Patent ID: 8040800

Claim:
A method for establishing a communication session between a first communication client located within a first communication network, and a second communication client, via a signaling server located within a second communication network distinct from said first communication network and connected thereto via a address translation device, including a step of binding a first address and a second address of said first communication client within said address translation device, by having said first communication client transmit registration messages according to the UDP protocol to the communication server, said method comprising: saving, at the communication server, an incoming signaling message sent from the second communication client and intended for the first communication client, replying, by the communication server, to the registration message from the first communication client that follows the saved incoming message with a reply message requesting that the first communication client send a new registration message using the TCP protocol, and delivering, by the communication server, said incoming signaling message to the first communication client after said new registration message using the TCP protocol has been received by the communication server.