Patent ID: 7876745
Filing Date: 2011-01-25
Classification: H04L,H04M,H04W

Abstract:
1. A method of operating an ingress entity of a packet-based network, comprising: the ingress entity, including a processor, receiving a stream of voice data; the processor passing the voice data through a processing stage, the processing stage including one of the group comprising applying data compression to the voice data, applying echo cancellation to the voice data, applying G.711 log-law coding to the voice data, applying silence suppression to the voice data and applying DTMF digit relay to the voice data; the ingress entity sending processed voice data across the packet network; a detection unit detecting whether the received stream of voice data contains tandem free operation (TFO) information and, if TFO information is present, removing TFO information from the stream of voice data before the processor passes the voice data through the processing stage, the ingress entity sending the TFO information across the packet network without passing it through the processing stage; the method further including the detection unit controlling the step of removing TFO information from the stream of voice data to ensure that the TFO information does not leak through to voice data, wherein controlling the step of removing TFO information from the stream of voice data to ensure that the TFO information does not leak through to voice data comprises a step of squelching TFO information in the stream of voice data.