[Asterisk-Users] FAX over PRI

[Tom Christensen]

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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