[Asterisk-Users] FAX over PRI

Fri May 19 09:43:20 MST 2006

We get the occasional bad fax, but it really is an occasional one, other
than that, it's fine.

We don't get any CRC errors or clock slips on the PRI, I'd certainly say
that it would be a good starting point to check the counters on these,
I'd also check that your drives are using DMA depending on your
hardware, we had a customer a while ago who ended up doing a self
install and none of his drives were enabled for DMA.

Steve

________________________________

From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Tom
Christensen
Sent: 19 May 2006 17:18
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] FAX over PRI

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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recipient then you are hereby notified that you have received this document in error and
that any review, distribution or copying of this document is strictly prohibited. If you have 
received  this communication in error, please notify Brendata immediately on: 

+44 (0)1268 466100, or email 'technical at brendata.co.uk' 

Brendata (UK) Ltd
Nevendon Hall, Nevendon Road, Basildon, Essex. SS13 1BX  UK
Registered Office as above. Registered in England No. 2764339

See our current vacancies at www.brendata.co.uk
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