Patent ID: 6498796
Filing Date: 2002-12-24
Classification: H04L

Abstract:
A method of determining whether a voice communication link between a first subscriber unit and a second subscriber unit in a voice communication system includes a tandem link, the first and second subscriber units transmitting and receiving a voice signal on the voice communication link and the voice communication system including a plurality of voice conversion units where each of the plurality of voice conversion units has a subscriber side link and network side link, the method comprising each of the plurality of voice conversion units performing the steps of:a) adding a HAIL signal to the voice signal provided on the subscriber side link; b) detecting a HAIL signal or an ACK signal in the voice signal received on the subscriber side link; and c) adding an ACK signal to the voice signal provided on the subscriber side link when a HAIL signal or an ACK signal is detected on the voice signal received on the subscriber side link, d) wherein a tandem link is detected when an ACK signal is detected in the voice signal received on the subscriber side link.