I could not have said it better than outtolunch and hello-kitty.
I have boundaries with my addict-brother, he has learned over time since I stick to them, that I am serious about them. He no longer asks me for money or for help while in his recovery.
My ex had issues with yelling and hanging up, also being disrespectful on the phone as well, and this is while he was in prison, I set boundaries with the calls, and eventually stopped taking them.
I agree that these boundaries are for you, and not for him, so stick with them!
Take care of you....