I agree with Heidi...there's far more to feline communication than simple vocal cord usage.
Pooping on the bed, flicking the tail as they walk away, chewing your head, blinking of eyes, whisker twiches, peeing on your leg, you know, all the things cats do to communicate to us.
See, they're really smart. Just ask Simon. He gets whatever he wants. He's polite enough to ask me first, but if I say no or misunderstand, he goes ahead and does what he wants.
He answers my cell and landline. He hangs out on the edge of the bathtub and discusses shampoo and water with me, cautioning me against too frequent encounters with water. He chats with me, tells me all about his day, and then procedes to nest on my neck, buried in my hair, purring a storm.
Oh sure, cats communicate with us regularly. We silly humans are too dense and stuck in the mud to understand their languages...because we use only one. Words. The joke, I fear, is on US! Just ask Simon.