Silence suppression through VAD

Voice Activity Detection (VAD) monitors the received signal for voice activity. When no activity is detected for the configured period of time, the software informs the Packet Voice Protocol. This prevents the encoder output from being transported across the network when there is silence, resulting in additional bandwidth savings. This software also measures the idle noise characteristics of the telephony interface. It reports this information to the Packet Voice Protocol to relay this information to the remote end for noise generation when no voice is present. Aggressive VADs cause voice clipping and can result in poor voice quality, but the use of VAD can greatly conserve bandwidth and is therefore a very important detail to consider when planning network bandwidth - especially in the WAN (Wide Area Network). G700 Media Gateways and other Avaya IP solutions can employ silence suppression to preserve vital bandwidth.