[asterisk-users] Dual dtmfmode?

[Andres]

We have an issue with incoming calls from a provider in which DTMF tones 
are sometimes sent using 'inband' and sometimes using 'rfc2833'.  All 
calls are G711 and the incoming SDP never indicates support for rfc2833.

Is there a setting in sip.conf that allows asterisk to receive DTMF 
tones in either inband or rfc2833 formats?  The option 'auto' does not 
work for us since the provider never indicates support for rfc2833 in 
the SDP.  An option like dtmfmode=inband,rfc2833 would be ideal.

Thanks,

-- 
Andres