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

[Dave Redmore]

I'm curious about your recommendation to use a long (600 sec) media/RTP timeout value in the sofia profile. Is this a specific need for the Audiocodes device or just generally better for T.38? I'm assuming you are referring to the "rtp-timeout-sec" parameter? 

I'm using FreeSwitch as a media proxy to a T38 provider and have had decent success, but usually have problems with longer faxes (8+ pages) and am wondering if this setting might help? 

Thanks, 

Dave Redmore 

----- Original Message ----- 
From: "Kristian Kielhofner" <kris at kriskinc.com> 
To: "FreeSWITCH Users Help" <freeswitch-users at lists.freeswitch.org> 
Sent: Tuesday, November 16, 2010 9:39:22 AM GMT -06:00 US/Canada Central 
Subject: Re: [Freeswitch-users] T.38 and Audiocodes or Patton gateway 

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 

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