Re: [hylafax-users] What does this error message mean

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

George H wrote:

> Using HylaFAX+ 5.1.7 and I got this odd error message when it was
> receivng a fax. There is also no error code apppened to the end
> between { }.
>
> "RCV FAX: PPM received with no image data. To continue risks receipt
> confirmation"
>
> First time I see it.
>  

I believe that the error number in brackets was added in 5.1.8.  If not 
then it will be in 5.1.9 for sure.  I didn't add the error number 
initially because 1) I forgot to, and 2) the error condition was kind of 
experimental.

It's a new error... and one that I felt was needed.

In the case where (in non-ECM) we recieve a signal such as MPS or EOP 
but it's pretty clear that we missed the page image data altogether that 
corresponds to that signal (instead of simply needing to repeat our last 
response to the signal) - then we have to choose between signalling MCF 
(confirmation), RTN (page quality rejected, retrain required before next 
page), or DCN (disconnect).

Responding with MCF would clearly get us into trouble because then we'd 
be confirming pages that we never got.  However, to some senders RTN 
amounts to a confirmation, but with the requirement that the next page 
be preceeded by retraining.  (This issue also applies to 
BadPageHandlingMethod.)  Many non-ECM senders are simply incapable of 
retransmitting the last page.  And so in some cases responding with RTN 
gets us into trouble as well... because to the sender's mind we're 
confirming a page that we never got in the first place.  To prevent this 
from becoming an issue and to make it clear to the sender that an error 
occurred and that the preceding page must be retransmitted and that it 
was not confirmed... we now therefore respond with DCN.

If you see this kind of thing repeatedly happening with any particular 
sender (or all senders in general) then it probably represents a problem 
with the modem or with the line audio quality that is making it 
difficult for the modem itself to "train" on the signalling from the sender.

Thanks,

Lee.


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