How to confirm that VAD is enabled and how to disable it on Cisco IOS gateways

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Resolution

To confirm whether  Voice Activity Detection (VAD) is enabled on a call-by-call basis, perform these steps:

1. Make a call.
2. Issue the show call active (brief) command.
3. Check the values for the Voice over IP (VoIP) call leg.

To disable VAD, perform these steps:

1. Confirm that the correct dial peer is being matched.
2. Issue the no vad command under the VoIP dial peer.