About 4 months ago users started to complain that their phones sounded garbled and had a lot of static. Recently, about 50% of our external sites can’t establish “Multiple Frames Established” through their T1 PRI interface. One of our sites briefly shows “Multiple Frames Established” but after a few seconds goes back to TE1_Assigned. I have been informed that the Cisco Call Manager will need to be rebuilt but haven’t been give a reason why since I’m not the Administrator of this system. I’m thinking that a configuration issue on the Cisco Call Manager could be causing these issues. Any insight you might have in resolving this issue would be greatly appreciated.
Troubleshooting performed: No mgcp mgcp Shut/no shut T1 0/21 and Serial 0/2/1:23 Verified router configs haven’t changed Cisco Call Manager is pingable from the routers Sh controller T1 0/2/1 (shows the lines are clean) Verified with the provider that there are no line issues