If you are sending the fax out your PRI line then your PAP2T with
AstLinux should work just fine, so disregard my earlier response about
T.38 and VoIP providers. Use the G.711 codec, echo suppression and
echo canceler off.
-Tod
On May 27, 2010, at 6:35 AM, Tom Chadwin wrote:
As always, I needed to be clearer in my description. Our only
trunking is ISDN PRI. We are only using SIP/IAX internally. So,
would a PAP2T (various of which I currently use for voice) work well
as the bridge between our internal analogue fax and our internal
Astlinux box, sending and receiving faxes externally via ISDN?
Thanks
Tom
From: David Kerr [mailto:[email protected]]
Sent: 27 May 2010 14:28
To: [email protected]; AstLinux Users Mailing List
Subject: Re: [Astlinux-users] Faxing
The answer is "it depends." I have had success with a fax machine
connected to a linksys PAP2T ATA and routing through vitelity as
the SIP trunk provider (with Astlinux in-between). I have had
complete failure with an older Linksys/Sipura SPA-2002 and the same
SIP trunk.
I have both a PAP2T and SPA-2002 connected to my system and the
audio quality is noticeably better on the PAP2T. In particular
there is a lot of background hiss from the SPA-2002 that is not
present on the PAP2T. That may also suggest that the dynamic range
of the SPA-2002 is not as strong as the PAP2T. Both the background
hiss and a compressed dynamic range would explain why analog fax
does not work well.
In addition to good A to D conversion, which the PAP2T seems to
handle well, you then have to deal with the characteristics of SIP/
VoIP. You may have to fiddle with settings like jitter buffer and
echo cancelling and you want a high quality trunk provider.
Good luck.
David
On Thu, May 27, 2010 at 8:17 AM, Tom Chadwin <[email protected]
> wrote:
Slightly OT...
With an uncustomized 0.7.2 (1.4) on a net5501 with a berofix PRI,
what is
the easiest way to attach an analogue fax which currently uses one
DDI on
the UK PRI? Will an ATA work?
Thanks
Tom
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