asterisk users - Oct 2004 - Fax over IP doesn't works

Hi ,

I tried this a lot, but with no sucess , even in a local network , there 
is always some loss and you receive only chunks of the original file .

Pedro.

Miroslav Nachev wrote:
>   Hi,
>
>   We try to send Fax through IP Network but without success. The
>other party use NetCentrex SoftSwitch and our communication protocol
>between us is H.323 (OpenH323). The error that the other party receive
>is: "bearer capability not imoplemented".
>
>   Is it possible to send Fax using Asterisk to the other party
>through IP network? What T.38 and Asterisk?
>
>
>   Regards,
>   Miro.
>
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Hi,

   We try to send Fax through IP Network but without success. The
other party use NetCentrex SoftSwitch and our communication protocol
between us is H.323 (OpenH323). The error that the other party receive
is: "bearer capability not imoplemented".

   Is it possible to send Fax using Asterisk to the other party
through IP network? What T.38 and Asterisk?


   Regards,
   Miro.

Dear Steve,

SU> So how does the FAX get from the fax machine to the T.38 channel
SU> with spandsp?

   In our case we will try to strip spandsp and will use directly
OpenH323. We do tests for compatibility with one of the biggest
national telecom and if they are OK, they will offer Asterisk based IP
PBX to their clients instead Cisco. That's why we need of T.38 and
G.711 fax capabilities.
   Also we have the problems with the following tests:
   1. When Dialing of unallocated number the resposne must be "Invalid
      Number", but the result is one of the following: Hangup,
      Congestion or Busy.
   2. CLIP/CLIR User provided verified and passed - We can't find
      where we can set this bits for this services.
   3. Fax T38 / g711
   4. Codec negotiation: when 2 codecs are possible (G.711 and G.729),
      the two parties can't negotiate which codec to use.


   Best Regards,
   Miroslav Nachev

   
Miroslav Nachev wrote:
>SU> and exactly how does that get the FAX into the T.38 channel? :-\
>
>   Using G.711 or implementing T.38 in Asterisk or adjusting Asterisk
>to OpenH323 T.38. From our expirience Asterisk detect that the line is
>with Fax data. The problem is what next.
>
>  
>
So how does the FAX get from the fax machine to the T.38 channel with
spandsp?

Regards,
Steve