No voice (even no noise) during a call when nobody speaks

[radoslav-drabik]

Hello guys,

Could you please help me with this bizarre situation? When we are on a call (Cisco IP phone -> CUCM 7x -> VG 3825 -> E1 to PSTN) and nobody speaks we cannot hear anything (even no noise).

Thanks for help.

[srsivara · Accepted solution]

Is the call being setup with g.729b ? g.729b has VAD (Voice Activity Detection) enabled by default.

If not, check if the codec / dialpeers getting picked have vad enabled. You can do 'no vad' on the dial-peers getting selected, and check again.

- Sriram

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