Patent ID: 7643412
Filing Date: 2010-01-05
Classification: H04L

Abstract:
1. A call server for use in setting up a communication session through a first media proxy, the call server being arranged to detect a blocking situation, where the first media proxy has received a first message comprising media packets from a first media gateway located near a first end of a path of a communications session for forwarding to a second media gateway located near a second end of the communications session path, and awaits a second message comprising media packets from said second media gateway, the call server being arranged to cause the first media proxy to send a probe message along the communications session path towards the second media gateway end of the path to determine if there is a second media proxy in the path of the communications session, and if so, to cause the first media proxy to send the first message to the second media proxy before receiving the second message from the second media gateway.