Originally Posted by vprMatrix

IMO the answers so far have not been completely accurate. I will try to explain simply, if that is possible.

First things first, Long Call is "NOT" rest! You are always in one of three categories, rest (free from company obligation), duty (this starts at trip report time), or company obligation (this includes on call time, training, or any other company obligation). This time is not considered part of your duty day however it must be counted as lack of rest for the look back Whitlow rule.

When a RES pilot finishes a trip you are released to Long Call not rest. Your are not required to have a rest period after a trip only prior to starting one. The only exception is if your last rest period was a reduced rest. In this case scheduling will give you comp rest and it will be assigned to you when you check your schedule prior to leaving the airport.

As far as a break in duty, it only occurs once you have been assigned something other than Long Call. i.e. a trip or a Short Call. Per the contract you receive a 10 hour free of duty after the first attempt to notify of a short call and you have 12 hours prior to a long call assignment. This is your break in duty. Note that this is after first attempted contact not actual contact. You have an obligation to acknowledge prior to three hours before your assignment.

Clear as mud.