The encoding of voice patterns for digital transmission of data and that
used for voice are very different. Therefore, the ability of fax (image
data) to robustly encode on a voice line is somewhat limited and performance
drop not surprising.

You may want to consider a mixed voip and PSTN installation. You may use a
CLT to bridge between you Telco gear and the two ports, voip and pstn

Marco
http://cgi.ebay.com/ws/eBayISAPI.dll...MESE%3AIT&rd=1


"Peter Corlett" <abuse@dopiaza.cabal.org.uk> wrote in message
news:42dd70ab$0$30800$db0fefd9@news.zen.co.uk...
> Al <e@aa.invalid> wrote:
> > There's been some discussion here about sending fax through VoIP
> > telephone adaptors. The consensus view seems to be that this can be
> > hit and miss, so pretty unreliable.
>
> I find that any sort of data (which includes fax) over VoIP on a BT
> ADSL link is unreliable. OTOH, it works just fine if you're running
> VoIP over an internal LAN, or over a high speed leased line.
>
> (I've found practical uses for fax-over-VoIP on an intranet, so it's
> not quite as silly as it first sounds.)
>
> > What I haven't seen discussed very much about INCOMING fax to a fax
> > machine attached to an ATA. Is the situation for incoming fax much
> > the same as outgoing fax (ie problematic and unreliable) or is
> > incoming fax ok?
>
> The problem is related to the jitter once connected, so it doesn't
> actually matter whether it's incoming or outgoing.
>
> --
> If your doctor warns that you have to watch your drinking, find a bar with
a
> mirror.
> - John Mooney