are you using 16k audio by any chance? The tone is supposed to be 1100 if 21 is working it's possible you are transcoding it and doubling the frequency? On Thu, Jan 27, 2011 at 9:31 AM, Helmut Kuper <helmut.kuper@ewetel.de> wrote:

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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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

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