[Asterisk-Users] Fax over IP doesn't works

[Steve Underwood]

Hi Miroslav,

It sounds like you don't really understand what T.38 is. You need some 
form of modem to get from a normal FAX machine to a T.38 channel. 
spandsp can do that. A normal FAX modem can do that. You need a modem 
somewhere, though. That is why developing the FAX modems was the first 
step towards providing T.38.

Regrds,
Steve


Miroslav Nachev wrote:

>   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
>
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