I believe we have done everything possible to keep a line of communication open to those people.

Al and I have always had an open line of communication.

Keep communication lines open so you know what's going on in their social lives.

And we got a potential problem with our lines of communication.

Now I try to keep the lines of communication open with her.

That means you need to keep open lines of communication.

Try to stay positive and keep the lines of communication open.

Or is this someone you need to keep lines of communication open with for some reason?

She was giving him no more of herself than had always gone over the communication lines between the stars.

"The president has made it very clear that those lines of communication would be open."