We've been testing new VTI routing on our remote sites. Some of our sites use DSL some use 3G as their backup. We're preventing access to the UCM's because of obvious reasons. During our testing we saw that MGCP packets were still making it to and being sent by the remote routers. We had to tighten up the ACL's a bit. But now when the router recovers to the primary path the PRI's won't backhaul to the UCM's. We see MGCP packets flowing ephones unregistering and registering back to the UCM. The router registers back to the UCM everything looks fine except the backhaul on the PRI. Show isdn status shows that it's up and running with all layers looking good except it's not backhauled and no calls are working. We can see the call come into the router but they're dropping with 'unallocated number'. I turned on debug ccm-manager backhaul and see these messages over and over again:
Jul 15 21:02:24.068 EDT: cmbh_xport_rcv: Could not process message for channel A000
Jul 15 21:02:24.068 EDT: cmbh_xport_rcv: No channel record for this
I finally gave up and did a no ccm-manager config and a ccm-manager config and that triggered the UCM to reconnect everything. Everything was back to normal backhauled and all.
I searched the whole internet including this forum cisco.com for those debugs and found nothing.
We're running CUCM 126.96.36.19900-2 and IOS 15.0(1)M.