Voice gateway with downstream voice synchronization

A synchronization circuit, comprising:

• an error generation unit that generates a clock error signal as a;
• and
• a sample tracker adapted to receive sampled data packets, wherein the sample tracker fractionally resamples the sampled data as a function of the clock error signal,
• wherein said error generation unit comprises one or more counters incremented by a local reference clock, a first latch adapted to store count of at least a portion of a cycle between packet arrivals, a second latch adapted to store at least a portion of a cycle between packet completions, wherein said clock error signal is a function of ratio of packet arrival count and packet completion count.

A network gateway adapted to exchange voice signals between a network line at a first clock frequency and a packet based network at a second clock frequency, comprising:

• a network port to interface with the packet based network;
• a telephony port to interface with a telephony device;
• a processor coupled to each of the ports;
• and
• a voice synchronizer coupled between said network and telephony ports and comprising an error generation unit for generating a clock error signal in accordance with ratio of said first and second clocks and a sample tracker, and adapted to receive data packets, wherein the sample tracker fractionally resamples the received data as a function of the clock error signal.