[Asterisk-Users] IAX2 and DTMF

[Eric Wieling aka ManxPower]

Brent Goran wrote:
> For efficiency & reliability, when SIP transmits DTMF as non-audio data,
> it uses RFC2833 or INFO.
> 
> My question is - (not knowing much about IAX2) - when IAX2 transmits
> DTMF as non-audio data - is it also using RFC2833 and/or INFO, or it it
> using some other IAX2-specific mechanism with its own name?

I believe it uses it's own method.  IAX and IAX2 do not support inband 
dtmf in anyway.