[asterisk-users] FXO Cards - T38

[Rob Hillis]

T.38 is a codec in exactly the same way that GSM or G.729 is a codec, so
yes it /can/ be used at the same time as any other codec - just that
only /one/ codec will be used at a time.  What often happens is that the
call will initially be established with a codec such as G.729 or G.711a,
but once fax tones are detected the call will change codecs to T.38.

According to the release notes for 1.6.0-b4...

 - 11873, Added core API changes to handle T.38 origination and termination
   (The version of app_fax in Asterisk-addons now supports this.)


This should be all that is necessary to run a T.38 gateway.


Steve Underwood wrote:
> Rob Hillis wrote:
>   
>> Not unless you're running CallWeaver or Asterisk 1.6.0-beta4.  Asterisk 
>> has had passthrough support for T.38 for a while (somewhere in 1.4 it 
>> became available IIRC) but is currently completely incapable of 
>> terminating or encoding a fax call to T.38.
>>   
>>     
> I thought * was still not capable for T.38 gateway operation. Doesn't 
> beta 4 just added T.38 termination? And, I believe it misses out some 
> key elements of doing that properly. Note that T.38 termination is an 
> addon, so it can't be used with, say, G.729.
>   
>> The only real option available at the moment is to keep one PSTN line on 
>> an ATA with an FXO port and T.38 support available and direct calls from 
>> the fax machines through to it.  However, I should point out that while 
>> I believe this should be possible, I haven't actually tried it myself.
>>
>>   
>>     
> Steve
>
>
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