One of them is "in a Call" status.
In the video:the left is my Mobile R2 communicator and on the right is the PC Communicator R1 running against a OCS R1 server.
Notes that presence will change to "in a Call" when using the mobile.
Download the Mobile R2 Communicator here and the user guide here
It's NOT SUPPORTED running Mobile Communicator R2 against OCS R1 server and a lot of the new functions won't work before you have a R2 server
