Patent ID: 8064435
Filing Date: 2011-11-22
Classification: H04L

Abstract:
1. A method of interworking a communication connection between a SIP (Session Initiation Protocol) endpoint and an H.323 endpoint, wherein the SIP endpoint is a first voice over internet protocol (VOIP) phone device separate from a session border controller device performing interworking and communicates over a first VOIP; and wherein the H.323 endpoint is a second VOIP phone device separate from the session border controller device and communicates over a second VOIP, the method comprising: determining, by the second VOIP phone device, using an extended capabilities set field embedded in an H.323 message sent to the H.323 endpoint, whether a communication message of the second VOIP has a counterpart in the first VOIP, wherein the extended capabilities set field includes a first VOIP identifying indication, provided from the first VOIP phone device, that indicates what VOIP the SIP endpoint communicates over; and discontinuing sending, by the second VOIP phone device, the communication message of the second VOIP, if the communication message of the second VOIP has no counterpart in the first VOIP, wherein a terminal capability set (TCS) message and a TCS master-slave determination (TCS/MSD) message are not sent and the session border controller device avoids TCS/MSD procedures.