[Freeswitch-users] Problems with t38 and tone detection

[Anthony Minessale]

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 at ewetel.de> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> 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/
>
> iEYEARECAAYFAk1Bj74ACgkQ4tZeNddg3dzmugCgkLtnqsaBnf5Yhqz/BtDBzh35
> gz0AniwyCAtR5gKQZHc0GSmF3nxyhNqR
> =gI21
> -----END PGP SIGNATURE-----
>
> _______________________________________________
> FreeSWITCH-users mailing list
> FreeSWITCH-users at lists.freeswitch.org
> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users
> UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users
> http://www.freeswitch.org
>



-- 
Anthony Minessale II

FreeSWITCH http://www.freeswitch.org/
ClueCon http://www.cluecon.com/
Twitter: http://twitter.com/FreeSWITCH_wire

AIM: anthm
MSN:anthony_minessale at hotmail.com
GTALK/JABBER/PAYPAL:anthony.minessale at gmail.com
IRC: irc.freenode.net #freeswitch

FreeSWITCH Developer Conference
sip:888 at conference.freeswitch.org
googletalk:conf+888 at conference.freeswitch.org
pstn:+19193869900