AAR CALL ROUTING

[sreekumara93]

I have tried to route the call with AAR in a home lab set up. But i am having a doubt about the call routing issue.

I have two branches site HQ and site BR. While the call is denied with standard location CAC, the call is routed to remote site and hitting the branch router through e1 trunk. But the IP Phone is not ringing, meanwhile i have set an analog phone and wrote dialpeer for that; the analog phone is ringing.

My doubt is how can we route the call to ip phone, because it is a Multi site with Centralized deployment model all the phones are registered with HQ cucm only, then how the router can route the call to the particular ip phone with a External phone number mask?

Can anyone help me with a call flow while the call hitting on remote site router ?

[Jaime Valencia · Accepted solution]

The phone at the branch needs to have a DID, AAR will change whatever internal dialing you have, to that DID so the call is routed over the PSTN and rings the phone.

If not a DID, you would need to perform whatever changes are necessary so that the call coming from the PSTN hits the phone.

[sreekumara93]

First of all i am using a home lab set up, here the call that reached on the remote site router through pstn, But how the remote branch router come to know there is phone existing with this number to route the call, because the phone that registered with CUCM, router is not aware about the phone.

Here i am attaching a pic of my scenario. Kindly look forward it.

[Chris Deren · Accepted solution]

Did you get a chance to read the AAR section in the SRND and features/system guides?

AAR works by detecting out of bandwidth set by CAC and using the AAR group assigned to calling device and called DN to decide what digits to prefix, then routing the call using the calling device's AAR CSS.  In order for this to work the AAR destination either set by that filed or external phone number mask needs to be reachable directly from PSTN at the remote site, i.e. would not work with centralized trunking approach.