[cisco-voip] NFAS with D Channel Back Up

[Michael Thompson]

Very valid point Jason, but if they have, say, 6 PRI's, they can break it up
into 2 NFAS groups and create a trunk group from A to B on the Telco side.
With 6 trunks, they only gain 1 channel, but as it scales up after that.

DNFAS (distributed) should be something that cisco is working on if they're
not.  I would have to think that NFAS can't be any chattier than something
like SCCP or MGCP.  Supporting NFAS through MGCP would be cool to,
especially since all the D-Channels are backhauled anyway.

But these are just 2 of the things that I think could be done that aren't
(i.e. friggin FXO caller ID on MGCP which is finally coming to pass).  

  _____  

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Jason Aarons (US)
Sent: Tuesday, July 29, 2008 2:58 PM
To: James Buchanan; STEVEN CASPER; cisco-voip at puck.nether.net
Cc: RAWLE GORDON
Subject: Re: [cisco-voip] NFAS with D Channel Back Up

 

IOS NFAS requires the PRIs be on same chassis with H323 which defeats high
availability.  I would work with telco to issue change order to remove the
NFAS and split the PRIs between two or more 28xx/38xx. You can then have
telco use Trunk Groups for incoming and you can use Route Groups/Route Lists
for outgoing.

NFAS was great when you had one really big refrigerator PBX with full
redundancy, but when you have distributed routers it doesn't fit as well.

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of James Buchanan
Sent: Tuesday, July 29, 2008 2:51 PM
To: STEVEN CASPER; cisco-voip at puck.nether.net
Cc: RAWLE GORDON
Subject: Re: [cisco-voip] NFAS with D Channel Back Up

 

You can use NFAS since the requirement is that you use H323. 

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of STEVEN CASPER
Sent: Tuesday, July 29, 2008 1:47 PM
To: cisco-voip at puck.nether.net
Cc: RAWLE GORDON
Subject: [cisco-voip] NFAS with D Channel Back Up

 

 Getting ready to finally convert PSTN trunking from some larger Nortel PBX
systems to Cisco gateways. Up to this point we have been using PRI tie lines
between the PBXs and Cisco gateways and routing PSTN calls via the PBX.  On
the PBXs we are using various PSTN PRIs using primary and backup D channels
and in some cases NFAS. Can these connectivity options be recreated in a
Call Manager 6.1 environment or will I need to order new PRIs with
individual D-Channels? Can not seem to find any info on this

 

We use a combination or 28xx and 38xx gateways

 

Thanks!

Steve


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