[asterisk-users] OT - Is T.38 possible on SPA8800 FXO port ?

Kevin Larsen kevin.larsen at pioneerballoon.com
Tue Nov 18 08:19:54 CST 2014

> I know all this.
> My question came from the fact that as strange as it may seem, SPA3102
> and similar products do not offer the SIP features depending on
> terminating/originating port.
> More precisely, when a SIP fax call comes in through an FXS port, it
> triggers T.38 while it doesn't trigger T.38 when an FXO port is used
> instead.

So, if i understand the question correctly, you have:
     Asterisk SIP-> SPA3102 FXS -> Analog fax machine
and the PBX to SPA3102 communications are T.38 before converting to analog 
to go to the fax machine. Then in the other situation you would have:
     Analog line -> SPA3102 FXO port -> Asterisk SIP
and the SPA3102 to Asterisk communication isn't doing T.38?

If that is the case, the only thing I can think of is that maybe they were 
not thinking that many people would want to do the second situation with a 
low end device? I imagine the main use case it to keep the old analog 
device around after switching to SIP delivery. Probably didn't expect to 
see analog delivery that gets translated to a sip fax endpoint. 

Though I do agree that once you have the transcoding option, I would think 
it would be trivial to apply it to both ports.
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