[Asterisk-Users] Re: SpanDSP TXFax and multipage faxes problems (aditional info)

[Nenad Radosavljevic]

Thanks for the information Lee !

Still, something is still strange to me, since this two Panasonic Fax
machines are receiving at least 20 multi-paged faxes a day (they are in same
office as both Asterisk boxes, and me :) ). Beside that, POTS lines in those 
two faxes
are from same PSTN switch as line in X100P in one of Asterisk boxes, and the
ISDN PRI lines in other Asterisk box is from same PSTN switch also.

I there is probelm in audio path, then how is it possible that first page is 
crystal clear always ?

I really don't understad how the line condition can affect sending from 
X100P to a
Panasonic faxes and don't affect sending to PRI on another Asterisk.

Even more strange is that when I send from Asterisk with a PRI, Panasonics 
don't
get more that one page of fax and Asterisk with the X100P gets it all ?!?

I don't want to jump to conclusions, but this seems to me that is more like 
that txfax has
some "issue" with Panasonic during the hanshaking phase in between pages ???

Regards,
        Nenad

> Nenad Radosavljevic wrote:
>
>> Hi everyone !
>>
>> I have some aditional info on problem with TXFax and sending
>> multi-page TIFFs.
>>
>> I have made 6 different multi-page TIFFs (Group3 1D with fillbits EOL
>> aligned - 3 pages one TIFF in lowres and one in hires, Group3 2D -3
>> pages againg in both resolutions , and Group 4 - 3pages in both
>> resolutions)
>
>
> You can't send G4 (MMR) images with spandsp yet.  MMR support requires
> ECM support.  So if it actually transmits, then txfax is probably
> converting the image on the fly.
>
>> , and then tried to send them to Panasonic KX-F1100, Panasonic KX-F500
>> and SpanDSP RXFax on different Asterisk server then sending one, over
>> POTS.
>>
>> Results are:
>>
>> 1. KX-F1100 always gets first page and if fax is in HIRES it delivers
>> empty second page and hangs up (report say communication error).
>>
>> 2. KX-F500 gets always gets only first couple of centimeters of first
>> page and hangs up (again communication error).
>
>
> These sound like the receivers are detecting carrier losses when they
> shouldn't.  Meaning that the communication path is not clean.  Somewhere
> between sender and receiver there is significant audio loss or audio
> corruption occurring.  But that is not happening between your two
> Asterisk boxes.
>
> Lee.