These are the three locations where VAD-related commands are configured:
On the dial peer: The vad command must be enabled. VAD is on by default. Issue the no vad command to disable it. For calls coming into the router from the packet network, the router matches an outbound Plain Old Telephone Service (POTS) dial peer to terminate the call. In addition, the router matches an inbound voice network dial peer for features such as codec, VAD and QoS.
Globally: The voice vad-time command is defined as the time that the transmitting side continues to send packets after the silence has been detected. This command is useful in tuning comfort noise transitions when VAD activates.