Yesterday I posted regarding random issues with my Nortel Meridian switch option 81 having challenges. When users call or receive calls they cannot be heard or vice versa the caller is not heard, it happens sporadically not all the time and from a lot of phones located on different cards and Network groups for either digital and analog lines which is very diffcult to troubleshoot. Dial tone does not seem to be a problem today so at least that seems to be working. It's like chasing a ghost. Any one out there have any idea what the problem could be?