[Asterisk-Users] FAX over PRI

Fri May 19 09:58:02 MST 2006

I have a setup like yours as well, IE, I have a fax machine connected into
the FXS port, and I can fax and receive faxes to the actual machine 100%
it is just receiving faxes in spandsp that exhibits this problem.  I don't
want to blame spandsp though, because if I send a fax directly from that fax
machine to a spandsp extension (from fxs port into asterisk, not traversing
the PRI) I get 100% success rates in spandsp.  Also, with these machines
plugged directly into an FXO analog line, I get 100% success rates in
spandsp, it is only over PRIs that I see this problem.

On 5/19/06, Noah Miller <noahisaacmiller at gmail.com> wrote:
>
> Hi Tom -
>
> > I have had nothing but problems receiving faxes over PRIs with
> spandsp.  I
> > currently have 4 systems, 4 PRIs from 4 different providers... none of
> them
> > get better than 50% success rates receiving faxes in spandsp, I
> constantly
> > get cut off pages.  No body seems to have a fix for it, and it is really
> > frustrating.  Supposedly it is caused by "frame slips" on the PRI, but
> if
> > that is the case, I am 4 for 4 getting crappy PRIs that can't keep time.
>
> Just an aside thought (sorry to hijack the thread, Steve):
>
> 50% - Ouch.  I only have one PRI at one of our offices, but we use it
> to receive faxes that are directly sent via Digium FXS to an analog
> fax machine.  I've never formally tallied up the transmission errors,
> but we get something close to 100%.  Maybe spandsp is an issue here.
>
> - Noah
>
>
>
> On 5/19/06, Tom Christensen <tomsmaillists at gmail.com> wrote:
> > I have had nothing but problems receiving faxes over PRIs with
> spandsp.  I
> > currently have 4 systems, 4 PRIs from 4 different providers... none of
> them
> > get better than 50% success rates receiving faxes in spandsp, I
> constantly
> > get cut off pages.  No body seems to have a fix for it, and it is really
> > frustrating.  Supposedly it is caused by "frame slips" on the PRI, but
> if
> > that is the case, I am 4 for 4 getting crappy PRIs that can't keep time.
> >
> > These same boxes work fine when receiving faxes over fxo ports, or if I
> plug
> > a fax machine into an fxs port and call in to a spandsp extension the
> fax
> > will be received just fine, so I am left thinking it must be the PRIs,
> but
> > if all PRIs are this bad, how can anybody be using them?
> >
> > Tom
> >
> >
> > On 5/19/06, Steve Hanselman <SteveH at brendata.co.uk> wrote:
> > > Sorry for the late reply but both of these are fine, we use spandsp to
> > > print some faxes and email others.
> > >
> > > We also route via a PRI to our other phone system to hylafax on an
> > > analog modem and also to an analog fax.
> > >
> > > So what you want to do is fine and will work.
> > >
> > > Steve
> > >
> > >
> > > -----Original Message-----
> > > From: asterisk-users-bounces at lists.digium.com
> > > [mailto: asterisk-users-bounces at lists.digium.com] On
> > Behalf Of Michael
> > > Gaudette
> > > Sent: 21 March 2006 20:34
> > > To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
> > > Subject: RE: [Asterisk-Users] FAX over PRI
> > >
> > > Hmmm, Im not so sure I can apply this to me though.  I just want to do
> > > Fax-To-Email using PRI channels as the incoming lines.  Not so much
> > > transfer
> > > to a real fax.
> > >
> > > I am assuming that this is easily done with Asterisk? (I did it before
> > > with
> > > Asterisk SIP, but it only worked once every 10 tries or so)
> > >
> > > Mike
> > >
> > > -----Original Message-----
> > > From: asterisk-users-bounces at lists.digium.com
> > > [mailto:asterisk-users-bounces at lists.digium.com] On
> > Behalf Of Andrew
> > > Kohlsmith
> > > Sent: March 21, 2006 3:25 PM
> > > To: asterisk-users at lists.digium.com
> > > Subject: Re: [Asterisk-Users] FAX over PRI
> > >
> > > On Tuesday 21 March 2006 15:09, Michael Gaudette wrote:
> > > > How should I consider Fax over PRI channels with Asterisk?  Is the
> > > > quality and reliability good, or should I be prepared for alot of
> > > grief?
> > >
> > > I'm having good success doing fax over PRI using a TE405; one span to
> > > the
> > > PRI, the other to an FXS channel bank that is almost obscenely
> > > underutilized
> > > (3 channels).
> > >
> > > I also have channel bank - T100P - IAX2 - TE405 - PRI, where the IAX2
> > > link
> > > is a 1-hop SDSL (VOIP only) data link.  This works well too.
> > >
> > > -A.
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