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Hey guys, I did all you suggested. I made over 100 test calls one night and answered them at the channel bank and could not duplicate the problem. But the receptionists continued to report isolated incidents. This went on for several days. Tuesday, I got a call reporting a rash of these...

I was wrong. The cards are NT7B75GA-93 and NT7B75GB-93. Still have not had time to check lines at Adtran. Thanks

NT7B69AAAC, if my records are up-to-date. I'll check this evening since I was going to do some testing when the phones are quiet. It is a 24 hr. facility.

Thanks much luv2ski, I considered that, but it happens so sporadically it is difficult to catch it when it does. It may go days with no problem, then it starts again. I had it happen one time when I was on site, but I could not make it happen again. I'll try it at the CB and let you know what...

Customer has a Nortel MICS system with 7.1 software , 6 port fiber expansion module, 2 DS trunk modules and 4 ASMs. Eight analog lines are supplied by the LEC via T-1 to an Adtran channel bank. All lines ring to two T7316 phones on ports 101 and 102 and a T7208 on port 111. There are two...