Some numbers forward via DSN to "red phones" and what not. Please don't prank them or waste their time. I had a spouse social engineer the number to an overseas camp. It bloody rang the literal red phone used for CASEVAC operations on my helipad. Then she wanted to get pissed when I told her to hang up and call a civilian phone... "Well, don't you have call waiting?"... We are divorced now, of course.