Update the conference address as soon as the focus call is attached to the
conference. In fact, if the GRUU is kept in the conference address and the server changes it, it may happen that the client subscribes to the old conference address which cannot be routed anymore by the proxy and therefore a 404 Not Found response is sent.
Add list of chatroom dealt in a reource list SUBSCRIBE in the Rlmi content.
Edited by Andrea Gianarda