[asterisk-users] T.38 gateway ATA

Jeff LaCoursiere jeff at sunfone.com
Tue Sep 25 10:11:27 CDT 2012

On 09/25/2012 03:54 AM, Sylvain Rochet wrote:
> Hi Jeff,
> On Mon, Sep 24, 2012 at 08:18:53PM -0500, Jeff LaCoursiere wrote:
>> Hoping for some clarification.  I would like to setup a NORMAL (not
>> T.38) fax machine on an ATA, and have the ATA be a T.38 gateway to a
>> remote asterisk (1.8) server, which is doing T.38 relay (passthru)
>> to a provider.
>> Some amount of googling today seems to imply that most ATAs are just
>> T.38 passthru devices, and expect a T.38 capable fax machine,
>> otherwise just fallback to ulaw (and mostly fail, in my experience
>> so far).
>> So does anyone use an ATA that actually does the gateway transcoding
>> to a normal fax machine?  Or am I barking up the wrong tree?
> I am using Cisco SPA-8000 and Cisco SPA-3102 as POTS(analog)<>T.38
> gateway to an Asterisk 10 doing T.38<>RNIS gateway and it works fine (at
> least better than ulaw/alaw over the whole IP network).
> However I had to upgrade all ATA firmwares in order to get something
> working correctly.
> Sylvain

Aha!  That is what I am looking for.  What firmware rev are you using on 
the 3102?  So if I am parsing you correctly, the asterisk server the ATA 
is registered to is *also* a T.38 gateway, as you have directly 
connected ISDN?



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