[Asterisk-Users] FAX over PRI

[Noah Miller]

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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