We have a Hipath 4000 with Xpressions and Loop Start Trunks that will NOT release when the caller hangs up on the Xpressions. Xpressions (while listening on a Butt Set)just keeps talking and does'nt acknowledge a disconnect. The trunks revert to dialtone when the caller hangs up but again, Xpressions just keeps talking over dialtone, C.O. message of taking to long to dial, and eventually reorder tone. Is thier a timer that can be set or some other trick???? Thanks.