"A long call pilot may be released from on-call duty at 1200 base time on his last on-call day prior to a non-fly day (e.g., X-day, regular line day-off) if he contacts Crew Scheduling and requests to be released."

Per PWA 23.S.7

From what I have noticed it's not always automatic like someone else said. Check your rest info in icrew to make sure you are released and if not, call.