Re: [hylafax-users] No answer (T.30 T1 time-out) for SOME fax numbers

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

Peter Schoenster wrote:

> Hi,
>
> Error is "No answer (T.30 T1 time-out)" when modem is
> identified as class2(2.0) and "No carrier detected"
> when identified as class1. Hylafax works with both
> configurations. It will send faxes to many numbers
> with either configuration(s). (I took configurations
> from the /config directory and used those ... made
> only a change to dial out of the PBX and some
> identifiers). 
>
> using
> hylafax-4.2.1 
> on 
> 2.4.20 #2 Wed Aug 10 23:53:11 EST 2005 i686 i686 i386
> GNU/Linux redhat and modem is 
> MODEM USR U.S. Robotics 56K FAX EXT V5.2.9
> V32bis,V.80,V.34+,x2,V.90,V.92 Fax Options Class
> 1/Class 2.0 Line Options 
>
> I can send faxes to local numbers and to long-distance
> numbers. I have no troubles sending faxes to lots of
> fax numbers.
>
> For one fax number which gives the above errors, the
> fax will pick up after 4 rings and it will emit sounds
> which sound like a fax to me. I know because I called
> the number from my phone.  I was also able to send a
> fax to this number if I used our fax machine.
>
> Hylafax will call and hangup after 5 rings. I know
> this because I had it call my phone.
>  

If there are 4-6 seconds between each ring 4 rings could be as much as 
24 seconds.  Add to that the call time before the first ring, and you 
may come very close to 30 seconds... and at that point many fax devices 
will give up.  Note that T1 is 35 seconds... so if the initial 
handshaking does not occur before then the call will abort.

So, for testing, add a bunch of commas to the dialstring after the numbers:

ModemDialCmd:  ATDT%s,,,,,

Adding 5 commas will get you approximately 10 more seconds of 
negotiation time.  If that's not it, then it could be that your USR 
modem is incapable of hearing the receiver's CED signal.

Lee.


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