FAR117. If you are a regular line holder this month, and a reserve holder next month, when is the earliest that you are responsible to answer the phone or acknowledge anything? IOW, where does it say that I have to answer the phone at 23:59 to acknowledge a trip on Dec 31st? Which to me means that they cannot assign a trip (that signs in) to a regular to reserve converted line holder before 10:01am. (12:01 actually since I technically have 2 hours to respond) And... Who will be on short call at 00:01?