Like Dave said, you have to call. I flew with a reserve trying to get into a domicile in which he wasn't based, but lived. He watched the open time and regularly called to volunteer for the out of base trips so he wouldn't have to commute. Said he had pretty good luck with it, one month having to commute just once to the base he didn't live in, having picked up out of base trips to the base he did live in on the rest of his reserve days. One thing to his advantage was that his assigned base was large and had a lot of reserves, the base where he lived was much smaller and ran out of reserves quickly. If scheduler says he doesn't know how, just suggest he put fake DH on both ends of the trip.