NFAS isn't needed for redundancy.. You can do this with 2 PRI's just have
them in the same huntgroup at the CO.. All NFAS really does is free up a
extra B Channel.. For 2 PRI's it makes no sense.. For anything over 2 you
pickup 1 extra B channel per PRI.. We use NFAS on our RAS setup for the
ISP.. We get a extra 6 lines on our 8 PRI group.
----- Original Message -----
From: "Kevin P. Fleming" <[EMAIL PROTECTED]>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<[EMAIL PROTECTED]>
Sent: Wednesday, October 12, 2005 12:48 AM
Subject: Re: [Asterisk-Users] Dual PRI fail over
Tom wrote:
I currently have a single PRI however we are getting a second PRI, and
the
provider (qwest) wants to know if our PBX supports GSAS (they say its a
redundant d-channel technology but searching on google for GSAS reveals
less
than nothing). I've set something similar up before on a cisco 5350,
where if
one of the PRIs fails, all of the calls destined for either PRI will be
routed
down the one that didn't fail. Basically the 2 PRIs are bonded together,
and
act as one. During normal operation the calls come down each PRI in a
load
balanced fashion (IE if I've got 30 calls up, 15 will be on one PRI and
15 on
the other).
The term you are looking for is NFAS (Non-Facilities Associated
Signaling), and it's fully supported in Asterisk. You can configure your
two PRIs as a single trunk group with a primary and backup D-channel, and
calls can be handled on both PRIs equally.
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