I have a MICS 7.0 with a PRI circuit using 11 b channels and 1 d channel. The system worked fine for roughly 9 months but now the customer is having an issue where every hour, about 15 past the top of the hour, you cannot call out for about 5 minutes nor can calls come in. the customer also states they get a "half ring". I figure this happens when the lines become available again. I looked in the switch and no LOS, OOF or other alarms report. I do get a code of 310 under the system test log when this problem occurs. I replaced the 6 port fiber combo card a few months back and the problem seemed to be resolved, but here I am again with the same problem. I have had a vendor meet the last time this happened and the carrier does not see any issue occur when the lines drop. Any thoughts or direction is greatly appreciated on this THANK YOU.

John Boy

When all else fails,
Get a bigger hammer.