I wonder if you're receiving calling party disconnect from the service provider on your lines. The absence of this feature causes lines to get locked up in literally any brand of system. If you place each of the lines on hold and the calling party hangs up, do the lines drop properly? If not, that is likely the cause for your problem. You'll need to test this and if necessary, get them involved to correct the line issue.


Ed Vaughn, MBSWWYPBX