-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Clemens, Am 22.02.2011 13:31, schrieb Clemens Ebentheuer:
Thx Helmut,
I´ve allready tried this:
switch_ivr_tone_detect_session(session, "t38", "2100", "rw", timeout, 1, data, NULL, t38_gateway_start)
The recompile mod_spandsp and reload it into FS.
But no luck, I´ll try different frequencies.
Is it because FS doesn´t recognize it as a t38 fax?
Yes, no ReINVITE from FS means no detection of CNG or CED. AFAIK t38 works like this: a) establish a call to FAX b) exchange CNG and CED via G.711 c) Listen to CNG and/or CED and when present, switch to t.38 via ReINVITE More about FAX process is here: http://telecom.tbi.net/fax-call.htm It can be, that in your case the device is simply detecting the FAX tones itself before FS does. When the device sends a ReINVITE to FS FS has no chance to detect CNG anymore and hence never switch to t38. Just trace the sending FAX-Device for SIP-Signalling and you should se a ReINVITE from FAX-device to FS, if this is true. You should check your t38-Device configuration. See if it is able to let the t38 fax detection job only by FS. Establish a call from the Fax device to a phone. Can your hear the CNG signal when you pickup the phone? Does it suddenly stop? If so, the FAX device or FS/mod_spandsp has sent a t38-ReINVITE. Do you see something like "media Bug removed" in FS console (DEBUG level) after 20 seconds of listening to 1100Hz? If so, then FS failed to detect CNG, hence it never received it (or for too short to detect it). On my Grandstream ATAs this wasn't possible, so I had to search for a hack. Hope this will light up your problems a little bit.
If so, I´m wondering why rxfax in t38 mode is working fine then - with re-invite. Can't tell you with this, never tried that. sorry.
regards helmut -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk1jx5AACgkQ4tZeNddg3dy78gCfbnz5X5oZV1zICQfvcCGrVJE2 J9kAoJOhh36CtV02o/H8yILNIWEffrk0 =R6VY -----END PGP SIGNATURE-----