wait_for_silence not working through external gateway

[vidor]

I'm attempting to detect when there is silence on the call in order to play
audio file. If I dial to an internal extension the wait_for_silence and
detect_silence commands are working fine. 

However if dial out through an external gateway to PSTN I don't get expected
results. Silence is always detected, even if there is voice speaking.
I can detect DTMF commands fine...  

Is there any known issue or parameter required on the gateway in order to
detect the audio / silence. 

Thanks in advance!



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