We just recently rolled out a UC560 with CME 8.0/CUE 7.1.3/IOS 15.0(1)XA Release fc2. We have 48 users with combination of 7942 and 7962 phones. At present, we are experiencing intermittent fast/busy tone when dialing out and it happens only very small percentage of the time. However, the user can complete the same call by simply hitting the redial subsequently after it fails. We only have a PRI for all incoming and outgoing calls. Attached below is partial current configuration file. Any help or recommendation would be highly appreciated. Thanks!