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

[Steve Underwood]

On 11/16/2010 11:39 PM, Kristian Kielhofner wrote:
> 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.
>
Is your Audiocode's ECM support badly broken? Spandsp's T.38 terminal 
and gateway engines have been tested with numerous systems, and ECM is 
normally OK unless the other system does something stupid - which 
unfortunately a number of T.38 implementations still do.

Steve