Sam calls on Suzy with a special meow and he calls on anyone of us with another call and Suzy doesn't seem to respond to that latter call, so I asume it's a communication. But usually they seem to communicate with their tail and ears and eyes, depending on how they move, to tell what mood they are in (playing, annoyed, tired etc).
I think mine do. They don't need to say as much as they do when talking to me! I think the language barrier means they talk louder and slower to me than to each other and they have abbreviated the normal interchanges with each other. I also think they talk more with me in part because I enjoy their 'talking' and encourage it.
I agree with CyberPet that their preferred method of communication is non-verbal, with me or with each other!