[asterisk-users] Faxing through Zap cards

[z_gringo]

The issue isn't so much when the FAX leaves the PRI card, but when the fax goes from TDM to IP.   If the FAX is going from one PRI card to another PRI card, there should be no problem with faxing, but when you start trying to run faxes over IP is when you will most likely start having problems. 



> From: asterisk-users at kfife.mailworks.org
> To: asterisk-users at lists.digium.com
> Date: Wed, 3 Sep 2008 14:11:06 -0500
> Subject: Re: [asterisk-users] Faxing through Zap cards
> 
> On Tue, 2 Sep 2008 11:38:17 -0500, "James Sneeringer"
> <jsneerin at gmail.com> said:
> > On Sun, Aug 31, 2008 at 1:45 AM, C F <shmaltz at gmail.com> wrote:
> > > No, in the beginning you asked because you don't have the experience
> > > so folks like myself that do have the experience answered. It might
> > > work for you, no one knows and you THINK it will work, it's a hit and
> > > miss, stability is huge issue, thats where experience comes in. If you
> > > want something that I or the other people here just think works, then
> > > just get an ATA. If you want something we have experienced and know
> > > that it works, then get a channel bank.
> 
> I'd like to draw on your experience.  At one point you mentioned that
> the
> fax stability goes from perfect to "anybody's guess" when the call
> leaves the PRI card.  I think I understand the underlying architecture
> well enough to know why this is the case.  Here's the question:  
> 
> In an installation where there are only Analog Telco drops, can
> pri/channel bank reliability be achieved on analog cards by keeping fax
> traffic *within* a single Digium TDM card *because* of the fact that
> card would not be subject to the limitations of the PCI/PCX interface
> bus and/or underlying OS?  For example 4 analog fax lines into (and out
> of) a single TDM800--4 telco lines to 4 FXO, 4 fax machines from 4 FXS). 
> 
> Do you have any practical or theoretical knowledge as to whether similar
> reliability to the PRI/Channel-bank setup can be achieved PROVIDED that
> traffic is never allowed to leave the internals of the card.  Depending
> on how ZAP services the card, there may be exactly ZERO difference
> between the aforementioned setup and one involving multiple SEPARATE
> cards.  If traffic stays within the card, where (if anywhere) does the
> process becomes compromised?
> 
> Certainly it would be trivial to design a card that could handle fax
> pass-through, so the logical conclusion seems to be that NOT having done
> so was done to achieve a GREATER good in a mutually exclusive design
> trade-off.  I'm sure that I (and others) would be very interested to
> gain a better understanding of this if you (or anyone) can speak
> intelligently to it. 
> 
> Thanks
> 
> -Karl 
> 
> 
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