I had a NEC dealer come out ant install a caller ID daugher board for my 28I phone system. Immediately our voice mail went to pot. The phone would ring 4 times and attempt to roll over to vm but then it would stall and hang up. As as last resort the technician removed the daugher board and the voice mail once again began to work but it now answers with "Please try again" before the rest of the greating! How is this corrected?