Where do you store the information about established calls? Is it a core
database or cache?
lets suppose we have 2 FS servers sitting on top of a DB cluster. The
left server has a floating (public) IP. This floating IP can be moved to
the right server... according to the DB cluster, the right server
should be aware of all ongoing established sessions so, we could send
re-invite/update to both legs of every established call and perhaps use
uuid_hold to make it start sending RTP?