[Asterisk-Users] Dual PRI fail over

[Billy Huddleston]

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" <kpfleming at digium.com>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users at arizona.digium.com>
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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