I can not seem to get a call waiting feaure working again on a MICS T-1 Release 1. It was working up until I installed CLID cards so that caller id would work. I went in to their programming remotely today and saw that the key they are using is set up as F*78 it's labeled on their phone as link/pause. I tried changing the Link timer in the system but that didn't work. Any suggestions?