Patent ID: 7359406

Claim:
A system for providing synchronous telephony or POTS services over an asynchronous communications network, comprising: a gateway coupled to the asynchronous communications network having a first clock for creating a first clock signal and incorporating the first clock signal as a first timestamp in a packetized voice sample, and transmitting the packetized voice sample over the asynchronous communications network; a terminal interface for receiving the packetized voice sample from the asynchronous communications network and measuring the time of arrival of the packetized voice sample in a second timestamp; a synchronization module for receiving the packetized voice sample and the second timestamp from the terminal interface and extracting the first timestamp from the packetized voice sample and comparing it to the second timestamp to produce a second clock signal; and a codec receiving the packetized voice sample and the second clock signal from the synchronization module; wherein the codec decodes the packetized voice sample using the second clock signal.