[Asterisk-Users] DTFM tones almost completly muted.

[Ian Hailey]

Hello everyone,

I am trying to receive DTMF commands on asterisk from PSTN calls 
terminated at my asterisk box. I have tried to terminate the PSTN calls 
with both SIP and IAX using sigate.co.uk and voipuser as the PSTN 
terminator. When I listen to tones sent from the PSTN side (e.g. 
continuous DTMF tone of about 3 seconds) on the asterisk server (stored 
in the voice mail) the tone is more or less completely muted, just the 
initial tone start can be heard. I am using the G711 codec. Does anyone 
have any idea if these tones are on purpose muted by the service 
providers or any other reason why it does not work?

Thanks for any help.

Ian Hailey.