Re: [hylafax-users] Failed fax after 2 TOTDIALS: No carrier detected

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

Jean-Pierre Radley wrote:

> OK, you dial a number for the first time, so if you don't get a carrier,
> the software only tries once more.
>
> Next week, you dial that same number again.  This time, if I understand
> what happens, there will be an info file for that number created during
> the first attempt.  What happens then?

It will only dial twice ever for any job until it finds a fax machine on 
the other end.  At that point the info file is marked in a way that 
HylaFAX recognizes it as a fax machine number and then JobRetryNoCarrier 
will not apply to it.

I haven't worked with this feature much since it was changed from 
NoCarrierRetries, so my comments are based on previous behavior that I 
belive was retained.

Most of this dillema stems from an inability on analog lines to 
accurately detect if a call was answered or not.  If ringback detection 
were trustworthy and enabled on the modem then one could trust NO 
CARRIER to mean that a non-fax device answered and "NO ANSWER" results 
would be the only case where HylaFAX would need to redial.  Alas, 
ringback detection is not a trustworthy way to know if a call is 
answered or not (and even on digital lines trusting D-channel 
information isn't entirely trustworthy, either ... to know if we got a 
fax device or not - thanks in part to fax detection devices on voice/fax 
units).

So HylaFAX is trying to play a balancing act between the need to get the 
fax through and the desire to not anger people to whom we misdial.  
That's why the assumption is made that if we have found a fax machine at 
that number before that we can try until we exhaust the maxtries limit 
and that otherwise we must be more cautious about how we retry after 
getting a NO CARRIER result.

Lee.


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