Patent ID: 6657996
Filing Date: 2003-12-02
Classification: H04L,H04M

Abstract:
A method for improving voice quality between packet networks, comprising the steps of:detecting a communication link with compatible tandem codecs, one codec corresponding to each of a first and second packet network, wherein voice data is encoded according to a first codec in said first packet network and according to a second codec in said second packet network, including: sending a first identification code from each of said first and second packet networks to the other packet network indicative of a forwarding module and indicative of the codec implemented by said packet network, wherein said first identification code includes a first signature sequence embedded in the least significant bits of outgoing PCM samples; detecting said first identification code and determining compatibility; establishing a transition communication mode; transmitting a second identification code wherein said second identification code includes a second signature sequence embedded in the least significant bits of outgoing PCM samples embedded within said inter-network communication indicative of initiation of said transition communication mode; and establishing a transparent communication mode for passing packet data encoded according to said compatible codec, between said first and second networks without decompression; maintaining said transparent communication mode by continued transmission of said second identification code within said inter-network communication.