I would only allow the most important calls to go through.

It was an important call and he couldn't meet with us right away, so we made ourselves comfortable.

It could be the most important call he had ever made.

"How the hell do I know whether your call's important?"

From a nearby stone shelter, I make an important call.

"It is not necessary to say, as he expects this important call."

That must have been some important call he was waiting for.

I had an important call to make and it really was time to pull the plug on this guy.

Naturally that was a very important call on his time.

Our special Tarot line number may be the most important call you'll ever make.