[cisco-voip] AAR on H.323 gateway

[Andrius Kislas]

Andrius Kislas wrote:
> Hi,
> 
> I have an issue with AAR group parameter in a H.323 gateway. It doesn't
> work for me as I hoped it should. Short description of the situation:
> - CM 4.1(3)sr3b.
> - 60 sites with H.323 gateway in every site.
> - Expected to have TEHO (tail-end hop-off) for every remote site.
> - In case of lack of bandwidth call should be routed via its local gateway.
> 
> I thought that AAR is a perfect mechanism for this configuration. I
> place all gateways in the same AAR group and configure so that call from
> every site is prefixed with some number in case of lack of bandwidth.
> After this call is rerouted based on this prefix. This kind of
> configuration works great in Phone-to-Phone call, but it fails in
> Phone-to-Gateway call.
> 
> CallManager's debug shows that AAR_Neighbour=[]. This mean that even
> when a phone is an one AAR group, and gateway is in another AAR group,
> and prefix is configured for this pair, CM doesn't do AAR routing.
> 
> Cisco TAC told me than AAR cannot be used in this situation. But if so,
> I don't understand what is AAR group in H.323 gw parameters is used for.
> Could someone explain me this? Do you use AAR group configuration on
> H.323 gateway?
> 
> Thank you
> Andrius
> 
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Answer to my own question. AAR works Phone->to->Phone,
Gateway->to->Phone, but it DOESN't work Phone->to->Gateway. Sad but true.

Andrius