Questions about usage of RTSP Server and Client

[TchaikovDriver]

I know little about RTSP and I think it's similar to some C/S architecture application.
Wish that someone tell me if the description below is right:
With libstreaming, I can build an RTSP Server in an Android device(let's call it device A), capturing video and audio. Then I run an RTSP Client in another Android device(let's call it device B). Device B can easily play media which provided by Device A.

If that is true, then I am confused. It seems that examples do not behave like that (all devices are in the same LAN).