From Dokeos

Bandwidth Usage for VideoConference

Outgoing Stream:
7KB/s
Incoming Stream:
12KB/s

1 one2four VideoConference:
4 outgoing streams from every client: 4 * 7KB/s = 28KB/s incoming traffic on server-side
12 incoming streams to every client: 12 * 12KB/s = 144KB/s outgoing traffic from server-side

1 one2many Conference (up to 50 seats)
1 outgoing streams -> 7KB/s incoming traffic
50 incoming streams -> 50 * 12KB/s = 524KB/s outgoing traffic