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

[Lee Howard]

Nenad,

You said that the second page was terminating at some point after the 
start of the fax image.  There is no "handshaking" going on after page 
image data starts.

Because txfax does not currently support ECM the only reason why a page of 
image data would terminate prematurely is because the receiver detected a 
carrier drop when there wasn't one.

So, I really can't go into figuring out why things are happening the way 
that they are, I'll leave the hypothesizing up to you, but as I have 
experience programming fax receivers, I can tell you that the receiver 
will only truncate a non-ECM page when a premature carrier drop is 
detected.

Lee.


On Sun, 15 May 2005, Nenad Radosavljevic wrote:

> 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