System is a MICS early version Config,System Admin. I have added a set to night ringing for a particular line this line also appears on the main set (221) where gen del m/b is . In day mode call goes to m/b of set eg 234 if it isn't answered , switch to night mode the first 4 rings flash on the set then get aprox 2 rings and caller goes into gen del m/b not the m/b of set, main set is set to c/f after 6 rings extension c/f after 3 rings have made the line prime to ext also other sets in the system work fine in night modes for there lines. In day mode all lines appear only on sets except for 221 where they A&R