I am testing various Cisco PRI gateways in a CCM cluster (2x MCS7835 running v3.09) to understand call persistance during CallManager fail over - i.e. for a 24*7 voice environment. I have the following results when failing the "active" CCM subscriber (so that IP Phones & gateways are supported by the publisher):
6624 - IP Phone to/from analogue Calls remain up with speech path
VG200 (MGCP) - IP Phone to/from analogue calls remain up with speech path
IOS H.323 - calls are dropped (as expected as the gateway re-homes onto the other CallManager!)
DE-30+ - IP Phone ingress/egress calls lose speech path
6608-E1- IP Phone ingress/egress calls lose speech path
Now drop and re-establish all the calls, when the failed CCM (subscriber) is restored and the IP Phones and gateways re-register there is no interruption in the speech paths!!!! (Execpt for the IOS H.323 mode gateways which will drop the calls, again)
My real question is, have I missed some fundamental config or are there resticted gateways that support call persistance during CCM failovers? I had understood that Skinny based gateways maintained calls during CCM failovers - my testing shows this not to be the case!
Lastly, I had heard that there was a coming CCM v3.1 or IOS feature for H.323 gateways that will preservce calls during failovers - does anyone know if this is the case?
Regards... Phil.C