Polycom RealPresence RMX 1500 Administrator's Manual page 564

Network Security
The Management Network is logically and physically separated from the media and signaling networks.
There can be one Management Network defined per Collaboration Server system.
Each conference on the Collaboration Server can host participants from the different IP Network networks
simultaneously.
The following figure shows the network topology with three different media and signaling networks and one
Management network connected to the Collaboration Server (RMX) 4000.
RealPresence Collaboration Server (RMX) 4000 - Multiple Networks Topology Sample
Polycom®, Inc. 533