[Asterisk-Users] Changing DTMF mode depending on codec chosen

[Rich Adamson]

> I'm not quite sure if this can be done, but..
> 
> I use BROADVOICE as my outbound primary.  I have both g.729 and ulaw as my
> outbound preference with BROADVOICE. It seems that sometimes broadvoice
> honors my g.729 request, and that is the codec chosen for the outbound call
> via broadvoice.. Other times, I get ulaw.
> 
> The problem is, when I'm using g.729 I get 'inband is not supported on this
> codec'.. And when I'm using ulaw, rfc2833 doesn't seem to work..
> 
> Am I doing something wrong, or is it true that the dtmfmode has to change
> depending on which codec is being used. And, if that is the case, how can I
> tell asterisk to change the dtmfmode for the call depending on which codec
> is being used for the call?

Unless broadvoice changed something, they only officially support g711
(not g729). So, config your system to only allow ulaw and dtmf=inband
for broadvoice.

The g711 requirement is why I gave up and discontinued their service
since I have limited dsl bandwidth on my end.