Can you call the black phone?

Caleb had been bugging me to play a computer game. I told him that when I got done with my shower he could go and play. Well, just as I was getting out he ran down to play. As he was running down the phone rang, and I yelled for him to answer it. I didn't think that he had heard me as it kept ringing. But it stopped ringing, and then a minute later it started ringing again. I hurried to answer it, and it was a friend. My friend then proceeded to tell me that Caleb had indeed answered the phone the first time, and this was how that first conversation had played out:

Friend: Is your mom there?
Caleb: Yes, she is. But she is just getting out of the shower, and I'm downstairs playing a computer game. Could you hang up and call again, but call the black phone instead?
Friend: Ok, but don't answer the phone this time.

Caleb wanted her to call the black phone (which just happens to be the phone in our bedroom). He was so excited that I finally let him go play his computer game, he thought of a very good plan to not have to leave his game and come get me!!