A phone that only rings part time sounds like a system clock or time mode issue. What mode is yours in? The attendant console (ext 101) can control the time, or system programming can control the mode that the switch is in. Things like dialing 780,781,782, and 783 on the intercom will switch to Day/Night/Lunch/Break mode.
If you have access to installer programming, 101 and 102 control the method of switching and the time of day it does it.
Carl
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