Re: [hylafax-users] Faxing using VOIP

[Kimble Young <kimble@xxxxxxxxxxxxxxx>]

I hate to be negative but unless you're trying to fax over VOIP over 
ethernet you're going to have all sorts of problems. This is because 
internet links have lag and packet loss etc.

T.38 alleviates these problems a fair bit but needs equipment that 
supports it.

Regards,

Kimble Young

CG wrote:
> I upgraded to 4.2.0... Still no better over the VOIP line.
>
> It seems like every second or third fax fails in "No answer (T.30 T1 timeout)"
>
> Still, whole lines from the printed page are disappearing.
>
> Switching back to POTS fixes every issue except for the long distance fees.
>
> Please advise. Many thanks!
>
> CG
>
>
> --- CG <cgg007@xxxxxxxxx> wrote:
>
>
> > I saw that, but I don't see "sendfax" firing... I queue the fax up using
> > hfaxd.
> > I see FaxGetty, FaxQueuer, and FaxSend. I don't think my fax process uses
> > that
> > application at all!
> >
> > Before I wrote to the list, I tried using "DesiredSpeed" in
> > /var/spool/hylafax/etc/config and in 
> > /var/spool/hylafax/etc/config.ttyS3. It was an unknown command in both places
> > according to daemon.log ...
> >
> > I guess I still need a point in the right direction...
> >
> >
> >
> > Can you explain better the error correction for Class1 and Class1.0? 
> >  Would I configure my modem as a Class1 device instead of a Class2.0 device?
> >  Do all Class1 fax machines support error correction?
> >
> >
> > CG
> >
> > --- Giulio Orsero <giulioo@xxxxxxxxx> wrote:
> >
> >
> > > On Mon, 6 Dec 2004 10:56:33 -0800 (PST), CG <cgg007@xxxxxxxxx> wrote:
> > >
> > >
> > > > Hylafax 4.1.7 ...
> > > >
> > > > I'm trying to get HylaFax to use our VOIP line to fax out. I'm having a
> > >
> > > problem
> > >
> > > > where the received fax is missing lines. Tech support said to lower the
> > > > baudrate and try that. I see plenty of options in the documentation to set
> > >
> > > the
> > > man sendfax:
> > >  -B speed   
> > > Try  to transmit facsimile documents using the desired sig-
> > > nalling rate.  Possible speeds are: 2400, 4800, 7200, 9600,
> > > 12000,  14400,  16800,  19200,  21600, 24000, 26400, 28800,
> > > 31200, and 33600.  If the specified speed is  greater  than
> > > the  transmitting  modem  or  receiver is capable of, it is
> > > reduced to the highest possible speed both devices support.
> > >
> > > That is equivalent to  DesiredSpeed   param in /etc/hylafax/hyla.conf
> > >
> > >
> > > > Is there any better strategy for faxing over VOIP?
> > >
> > > You could try upgrading to 2.0 which has error correction for class1/1.0
> > > faxing.
> > >
> > > --
> > > giulioo@xxxxxxxxx
> > >
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