[Asterisk-Users] SIP/IAX2 DTMF

[Tais M. Hansen]

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Hi,

When making a call like the one below, I get double DTMF tones on the PSTN 
side. DTMF tones sent from the PSTN arrives squelched on the SIP side.

SIP > Asterisk2 > IAX2 > Asterisk1 > ZAP > PSTN

SIP has been configured to use rfc2833 on both the SIP endpoint and the 
Asterisk. SIP endpoint also suggests a payload value of 101.

Sending DTMF inband instead of via rfc2833 however eleminates the double DTMF 
but squelched DTMF is still present in the reverse direction. SIP on Asterisk 
was still configured as rfc2833 though.


In the setup below we do not experience double DTMF from SIP to PSTN but DTMF 
is still squelched from PSTN to SIP. SIP is configured for rfc2833 on both 
the endpoint and on Asterisk in this example.

SIP > Asterisk1 > ZAP > PSTN


It sounds to me like there's a bug here somewhere?

- -- 
Regards,
Tais M. Hansen
ComX Networks
Tel: +45-70257474
Fax: +45-70257374
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