[asterisk-users] FXO Cards - T38

[Michelle Dupuis]

Will the built-in T.38 support eliminate the need for spandsp?  I'm curious
how this will affect iaxmodem.
 
MD


  _____  

From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Rob Hillis
Sent: Saturday, February 23, 2008 7:12 AM
To: Asterisk Users List
Subject: Re: [asterisk-users] FXO Cards - T38


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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