However, I have to autonomous CME systems at two separate locations each with their own PRI. The two locations are connected via high-speed fiber. I want each system to function independently, using their respective PRIs to make incoming and outgoing calls, except in the case of failure. Both PRIs are from the same provider, and hosted on the same local telco switch, so if I need some cooperation from them to get this working I can do that as well.
The solution in the above link would work well, except that it prefers one router for outbound calls.
You can modify your configuration to use the local gateway at each site for outbound calls..Configure each ccme to have the local phones register to it and modify your dial-peers to use the local gateway first for outbound calls and the second ccme as backup..
You will need to work with your provider to determione how calls will be routed inbound when one of the PRI fails
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