My failure rate, objectively measured, is 3.8%, and this is with 100 - 400
a
day. Other than clock slips (which definitely adversely affects fax) I
also
note that load is an issue. A system with a higher load has a higher
probability of failing the fax. Unfortunately, I don't have precise
numbers,
as I have gotten a feel for this by watching 2 SSH windows to the same
box,
1 running top and the other running the Asterisk console.
-----Original Message-----
From: Noah Miller [mailto:[EMAIL PROTECTED]
Sent: Friday, May 19, 2006 10:32 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [Asterisk-Users] FAX over PRI
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 <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> 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: [EMAIL PROTECTED]
> [mailto: [EMAIL PROTECTED] 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: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On
Behalf Of Andrew
> Kohlsmith
> Sent: March 21, 2006 3:25 PM
> To: asterisk-users@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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