[asterisk-dev] dsp.c newbe question. fax detection in * 1.4.10.

Dmitry Andrianov dimas at dataart.com
Thu Aug 9 08:31:12 CDT 2007

If you look at dsp.c code, you will see that fax detection is basically
just a detection of specific frequencies in the voice stream. Which
means VOICE not DTFM.

-----Original Message-----
From: asterisk-dev-bounces at lists.digium.com
[mailto:asterisk-dev-bounces at lists.digium.com] On Behalf Of Alexey
Sent: Thursday, August 09, 2007 4:25 PM
To: Asterisk Developers Mailing List
Subject: [asterisk-dev] dsp.c newbe question. fax detection in * 1.4.10.

Hi everybody.
i try to understand a fax detection in dsp.c
will you help me with this?

which frame type should be detected in incoming fax on SIP channel?
AST_FRAME_DTMF or AST_FRAME_VOICE, or maybe something else?

Thanks, sorry for my endlish :).


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