121  VoIP Subscriber Gateways 
 
 
Fig. 8 - '3-way conference' service operation algorithm 
4.3.2  Remote conference 
Remote conference processing by algorithm, described in RFC4579. The feature of the algorithm 
is that the initiator subscriber establishes a connection with the conference server (also called a focus) 
by pressing flash + 3, and then requests for focus to establish a connection with two other conference 
participants. The figure below shows detailed operation algorithm.