Conference phones are meant for holding conferences between three and a
bigger amount of participants. This allows all participants listening and
speaking simultaneously. Usually the conference is begun by the participant
having “Conference Phone”. Other participants call to a special number for a
conference which connects them with “Conference Bridge” that joins all lines
together.
IDC projected over 9 billion minutes of voice traffic to travel over worldwide packet networks in 2000, exceeding 135 billion minutes in 2004. Service revenue is projected at 1.6 billion in 2000 and 18.7 billion in 2004.