[asterisk-dev] Analyze inband DTMF in channel driver

[Artem Makhutov]

Hello List,

I would like to add inband DTMF analyzation to chan_datacard.

When I got a call from GSM --> Asterisk via chan_datacard I have only 
inband DTMF.

When this call is forwarded to an other asterisk server via SIP or IAX
only audio get forwarded and the other server may get problems analyzing 
DTMF due to jitter, packet loss and audio codec compression.

So I would like to analyze the inband DTMF directly on the server that 
is connected to the GSM Network and forward all DTMF data out of band.

Can you give we some hints where to look to implement this?

Thank you, Artem

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