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