[Freeswitch-users] Problems with t38 and tone detection

[Helmut Kuper]

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Hello,

I'm using mod_spandsp and t38gateway function for FAX transport. Some
months ago I get it up and running and documented it in FS's wiki. What
I forgot is, that I had to modify mod_spanddsp.c in the following way:

replace this:
switch_ivr_tone_detect_session(session, "t38", "1100.0", "rw", timeout,
1, data, NULL, t38_gateway_start);

with this:
switch_ivr_tone_detect_session(session, "t38", "2100.0", "rw", timeout,
1, data, NULL, t38_gateway_start);


I'm not sure whether this is a dirty hack which works just for my
environment, or whether this is a general bug. This difference is the
frequency to which the gateways is listening.

If I use 1100 the gateway never detects the fax tone which is send by
the internal fax device.



regards
Helmut
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