For some reason we have begun dropping calls. Our PRI comes into a 2651 XM/V. This only happens on calls to or from the outside world, which is why I believe its at the router instead of in CCM. I get a "Lost Communication with Remote" on Serial 0/0:23 pretty regular and didn't know if that had anything to do with it. We've never had this problem up until last week. I don't know what it could be other than the PRI because we didn't make any changes to the router. Any help is appreciated.
A couple of things. One I don't see anything out of the norm with your configuration. Of course we do need some show commands to get a better feel. Since it's MGCP, you defintely want to make sure the link to CCM is clean for Backhaul. Even then I don't think that's the issue because that error you are receiving is L2 and the Backhaul is L3. But checking things doesn't hurt. Here are some commands you want to check.
sh ccm - look for recv/xmit failures to ccm.
sh controllers t1 0/0 - look for physical errors/slips
sh policy-map int s0/1 - look for drops in signaling
The 2nd thing is, here is a bug that might be similiar to your issue. It's a 12.3 bug, which you are running, though it references a 37xx using an AIM-Voice-30. It might be a long shot but read over and see what you think. The 2651xm/v should be using the AIM-Voice-30 as well, I believe.
ATA have two ports. If a port is not configured with anything, then the Call Manager will report it. Way around it is to disable the port from trying to register to CM. In the ATA configuration, change the . to a 0. This will disable the port. It sounds like CM was forcing a reset on the gateway. Since the gateway has been assigned to register to CM1 first and then CM2 and the device pool are setup to use CM2 and CM1, then that can be the cause of your problems.
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