Patent ID: 8396049

Claim:
A method in a telecommunication network of engaging a new transcoder device in an ongoing tandem free operation (TFO) session between a first transcoder device and a second transcoder device, the method comprising the steps of: controlling the tandem free operation session and insertion of transcoders into the session, wherein the new transcoder device is inserted into the session after a handover and the second transcoder device remains in the session during the handover; starting a timer for a predefined time period: the new transcoder device initiating a synchronization procedure of the new transcoder device and the second transcoder device while, simultaneously, embedding messages in the tandem free operation frames, which are sent to the second transcoder device during the execution of the synchronization procedure for controlling the tandem free operation; and the new transcoder device receiving TFO frames from the second transcoder device, before the timer expires, causing a TFO between the new transcoder device and the second transcoder device to become active.