[Asterisk-Users] Dual PRI fail over

[Billy Huddleston]

See this link: http://www.voip-info.org/tiki-index.php?page=NFAS

----- Original Message ----- 
From: "Billy Huddleston" <billy at nxs.net>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users at lists.digium.com>
Sent: Wednesday, October 12, 2005 12:57 AM
Subject: Re: [Asterisk-Users] Dual PRI fail over


> 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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