There are 3 different ways to send DTMF via SIP; 1)in audio 2)RFC 2833
and 3) via SIP info. You can normally set this on your phone and with
dftmfmode on Asterisk in sip.conf.
Niall O Broin wrote:
> I recently setup an Asterisk server which is the first one I have setup
> using an analog line card (a cheap clone). Works nicely (ignoring the
> fact that a Grandstream phone refuses to register to it, but that's
> another issue) but it seems to have issues recognising DTMF tones to
> navigate menus - sometimes it will, sometimes it won't. Does anyone have
> any idea what that might be?
>> I have googled, but find only reports of people having similar problems,
> for various reasons. It's like a dream to me that I once read that this
> can be an issue with clone FXO cards, but google hasn't been able to
> find that reference for me, so perhaps it WAS a dream :-)
>>> Niall
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