[Freeswitch-users] T.38 and Audiocodes or Patton gateway

[Kristian Kielhofner]

Tim,

  I've have good experiences with the MP-20x series using T.38 with FreeSWITCH.

  On the AudioCodes:
  Make sure your T.30 and T.38 redundancy settings are at least "1".
  Make sure ECM is disabled.
  Use the latest 2.6 firmware (not 3.x).

  In FreeSWITCH:
  Make sure ECM is disabled.
  Make sure to have a very high (600 seconds seems ideal) media/rtp
timeout parameter on the Sofia profile for the AudioCodes device.

  On the fax machine:
  Make sure ECM is disabled.
  Disable Super G3 or anything higher than 14.4.

On Mon, Nov 15, 2010 at 1:08 PM, Tim St. Pierre
<fs-list at communicatefreely.net> wrote:
> Hello,
>
> I am trying to get a reliable fax setup working.
>
> I have set up a nice fax receiver mechanism with mod_spandsp and it works very well when I send a
> fax using a Linksys SPA2102
>
> I have poor results with Audiocodes MP202B, and can't get anything to work with a Patton M-ATA
>
> I have a number of Audiocodes MP202B in service and would rather not replace them if I can avoid it.
>
> In each case, the fax fails with "communications error" on the sending machine, and "Call hungup
> prematurely" on the SpanDSP side.
>
> There aren't too many knobs on the gateways.  Are there any knobs in mod_spandsp that might help
> this condition?  Anyone else have any experience with these devices?
>
> Thanks!
>
> -Tim
>
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-- 
Kristian Kielhofner
http://www.astlinux.org
http://blog.krisk.org
http://www.star2star.com
http://www.submityoursip.com
http://www.voalte.com