when I build a new 500 set on a single line card it automatically fills in the wrls (wireless unit)prompt after I enter cust 0 prompt.It only seems to happen for this one cardslot.I swapped the card out and it still does the same thing when I out it and re-build it?????User's were reporting that the phone rings and when they pick it up they can not hear the caller.These were existing sets that were reported,Then when I saw wrls-yes I tried to out it and re-build it thinking that may have been the problem.We just upgraded from 25.15 to 25.40 opt. 81c.Any ideas??