[cisco-voip] AAR for WAN outage

[Malcolm Caldwell]

Karl,

On Wed, 2008-06-25 at 07:26 -0400, Karl Whitson wrote:
> Malcolm,
> 
> If you are using CM 4.2 or above you could use the Forward Unregistered setting on the line.  You would enter the full PSTN number on the Unregistered setting (make sure you include the proper CSS).  When the remote site goes into SRST mode (WAN down) the phone will unregister from Call Manager.  When you dial (from the HQ end) the 4 digit extension and the phone is not registered, it will send to the Unregistered setting.

This sounds like a good option.  Thanks for the suggestion.

One concern I have: if someone unplugs their IP phone, but the gateway
is still up we will have problems:
      * Someone calls the DN
      * CM forwards the call via PSTN to the gateway
      * The gateway, forwards the call to CM
      * CM forwards the call via PSTN to the gateway
      * etc etc

Thus filling our 4 ISDN channels on the branch router.

It would be fairly instantaneous, so it is probably not too bad, but it
is still something that would be better to be avoided.


> Hope this helps.
> 
> Karl Whitson
> CMB Technologies
> 100 Medway Rd.
> Suite 301
> Milford, MA  01757
> DID:  (508) 422-8413
> Cell:  (603) 930-4189
> Fax:  (508) 422-8425
> Karl.Whitson at cmbtec.com
> www.cmbtec.com
> TO OPEN A SUPPORT CASE EMAIL SUPPORT at CMBTEC.COM OR CALL (508) 422-8429
>  
> 
> 
> -----Original Message-----
> From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Malcolm Caldwell
> Sent: Wednesday, June 25, 2008 3:46 AM
> To: cisco-voip at puck-nether.net
> Subject: [cisco-voip] AAR for WAN outage
> 
> Hello,
> 
> Can AAR be used to re-route calls when a WAN IP link is down, or is it
> only used when there is insufficient location bandwidth?
> 
> For example our branch offices have 2821 routers with 2xBRI interfaces.
> The routers run SRST.  From our central site we normally dial 4-digits
> to reach a phone at the branch office.
> 
> During a WAN outage, the phones work due to SRST, but to call the site
> from our central site we must dial the full national numbers.
> 
> Can AAR help here?
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