Private Voice Handoff
Whether it is text or voice, both public and private communications are desired. Within a virtual world, communications can be established based on virtual proximity or thru a buddy list. As we move between VW's independently of the people we are in contact with, the communications channel should remain open.
A participant in a private conversation should have the option of handing off there side of the conversation to another client or device such as a mobile phone.
Bob is chatting with Bill in a virtual world. Bob needs to leave the virtual world, but Bill is staying. Bob can hand off his private conversation with Bill to his mobile phone as he leaves the virtual world.