Patent ID: 8457136
Filing Date: 2013-06-04
Classification: H04L

Abstract:
1. A method for reducing session setup latency comprising: receiving, at a communications server, a response message made in response to an invite message associated with a communication session initiated by an initiating terminal, and then transmitting said response message from said communications server to the initiating terminal; establishing the communication session at the communications server in response to the communications server receiving media packets from the initiating terminal without the communications server having received an acknowledgment message from the initiating terminal in response to the response message; and at least one of (i) determining whether the response message has been received from the communications server, (ii) determining a status with respect to transmission of the response message from the communications server to the initiating terminal, and after determining that the response message has been transmitted to the initiating terminal, establishing the communication session upon receiving whichever arrives first from the initiating terminal, the media packets or the acknowledgment message; or (iii) determining whether the media packets have been received, and cancelling a retransmission timer, on which retransmission of the response message from the communications server to the initiating terminal is based, once the communications server has determined that the media packets have been received.