DTMF will not pass reliably through *any* low bit rate codec, with the exception of some forms of ADPCM. GSM certainly does not work. When a VoIP system is configured properly it works just like a cellular telephone system, which suffers the same problem. It doesn't send the DTMF tones. It sends a message to the far end saying "outdial a digit X for me, please". In this way any low bit rate codec will work solidly for DTMF with a VoIP system.
Regards, Steve
Dr. Rich Murphey wrote:
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.
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