Patent ID: 6256612
Filing Date: 2001-07-03
Classification: H04L,H04M,H04W

Abstract:
A method of reducing speech delay and improving speech quality in a digital transmission system by implementing a single coder-decoder (codec) for an entire speech path from a calling mobile subscriber to a called client terminal in a data network, said method comprising the steps of:originating a call from the calling mobile subscriber to a mobile switching center (MSC) which is serving the calling subscriber;utilizing out-of-band signaling during call setup, said signaling step comprising the steps of:sending an indication of a requested codec type from the MSC to a gateway in the data network serving the called client terminal;determining whether the called client terminal supports the requested codec type; andsending a confirmation of the requested codec type from the gateway to the MSC, upon determining that the called client terminal supports the requested codec type;establishing a speech path from the calling mobile subscriber to the called client terminal; andperforming a single codec translation for the speech path;wherein the step of determining whether the called client terminal supports the requested codec type is performed utilizing a H.323 Fast Connect procedure.