Make sure that you have ONLY the voice mail ports in hunt group 7, then power off and back on. It should restart and update its clock to the system. Now, you didn't replace the enitre processor with one that had new batteries did you? 'Cause if you did, you need to have a 3.1 (?) or higher to synch the clock. If it is the same processor, just with a new battery soldered in, retarting should do it.