The company gives you a designated rest period be it 10 hours 14 or whatever. You are never required to answer the phone from the time they put you in rest until you go on duty. If you do answer the phone, you're only setting yourself up for trouble, especially if you and your crew are tired. You going to call them too? Not your responsibility. Some of these captains always answer the phone and never say no. They are the floating rest violaters and they will try to call the FO and the FA and get them up too. Not their job. They are the ones calling the company while they are in rest as well. Again, asking for trouble.The company FOM says they may contact you legally as long as there is 8 hours uninterupted rest. You never have to answer or have your phone on for that matter. The only time I would call the company would be in the last two hours of my rest block to see if things have changed. Why go to the airport and find that the trip was delayed or cancelled? It's floating rest only when you answer the phone and you call the company while in your rest period.