We are looking at installing a redundant gateway solution for one of our facilites. The existing PBX has a problem that could cause us to lose our ability to run a PRI. The thought was to bring each T1 PRI into two voice gateways. Those gateways would then connect with a T1 CAS to the PBX. One of the gateways will then have a T1 PRI to the PBX as well. We want the PRI for Caller-ID information. If the system fails, we want calls still able to flow.
T1 PRI1 --- GW1 --- T1 CAS1 --- PBX
T1 PRI2 --- GW2 --- T1 CAS2 --- PBX
GW2 --- T1 PRI3 --- PBX
We want the gateways setup in H.323 mode for call preservation. The problem I'm finding is this... I want all the calls going to the PBX to go down PRI3. In the event of a PBX failure, we want the calls to go down CAS1 or CAS2. If GW2 fails, we'd want to do the same thing.
Both GW1 and GW2 will have dial-peers built back to our Call Manager servers. (7.0)
Is what we're trying to acomplish possible?