I made a huge mistake last April. The day before a reserve day, the crew desk called and I answered. They gave me a 8am show the next day (first day of a reserve stretch). I was obligated because they made contact with me. If I had let the call go to voicemail, and called after 18:00, they could not have given me the trip. They can't start you before 10:00 on the first day of reserve following a day off.