03-04-2013 02:39 PM - edited 03-16-2019 04:03 PM
I have a centralized telephony environment with CUCM8.6 running at our HQ. We have a dozen branch sites that connect via MetroE back to HQ for call handling. The Branch sites use SRST in the event of a WAN outage. Each branch site has a few PSTN lines connected to FXO ports on a 2921 router.
In the event of a WAN outage at a branch site, I'd like to keep calls flowing from HQ to the branch site. Rerouting calls to the PSTN is the obvious answer. I'm looking for a suggestion as to how to best accomplish that.
I've tested Call Fwd Unregistered(CFU) to a PSTN line at the branch site. This worked perfectly. However, I don't want to have to change every extension's CFU setting. I'm looking for a global setting that will forward a particular sites calls to a PSTN number in the event of a WAN outage.
Is AAR the answer? I've read that CUCM can not detect an outage and AAR would not apply. I understood my readings to say that AAR only works when there is not enough available bandwidth. As a WAN outage = zero bandwidth, I would think AAR should apply in this situation.
Does anyone have any suggestions to my scenerio? What have you seen work best?
Thanks for your help!
-tom
03-04-2013 02:45 PM
Tom,
Forward on unregistered is your solution. AAR kicks in only when Call Admission Control invokes it after designated bandwidth to the location has been exhausted.
So, these are 2 comptely different features sets which are commonly confused.
HTH,
Chris
03-05-2013 11:02 AM
Thank you Chris. That confirms what I thought.
Now that I know that CFU is the answer, I'm looking for a way to not have to change 75 extensions. I can use BAT, but wanted to ask if there was a better way. Perhaps a setting on the gateway or device pool config???
03-05-2013 02:31 PM
Hi Zebra,
The easiest way is use Bulk administration tool.
Regards
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MDGDP, CCNA, CCNA Voice, CCNP Voice Certified
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