I am working on a MICS and this problem started within the past week or so. Sometimes when the receptionist attempts to transfer a call, either to an extension or directly to voice mail, they will get the not in service message on the display but the ext does exist. it eventually lets the call through after multiple attempts. This also happens when she tries to park the calls. This happens about 3-4 times per hour and is frustrating since the call volume is high. Did this ever happen to anyone else and if so, what's the deal?