[Asterisk-Users] Low Bit Rate Codecs

[brian]

> If you take into consideration the need to pass DTMF to/from various SIP
> providers, how do they rank?
>
> I'd given up on g729 completely because none of the dtmfmode options
> seemed
> to work with g729 for several sip service providers.  GSM seems to work
> fine
> in general.

rfc2833 should work if not then your provider is at fault for not
regenerating the DTMF tones as you dial.

bkw