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RealPresence Collaboration Server (RMX) 1500/1800/2000/4000 Administrator’s Guide
Polycom®, Inc. 244
Automatic Identification of the Cascading Link
In both dialing methods, the system automatically identifies that the dial in participant is an MCU and creates
a Cascading Link and displays the link icon for the participant ( ). The master-slave relationship is
randomly defined by the MCUs during the negotiation process of the connection phase.
Basic Cascading using ISDN Cascaded Link
ISDN connection can be used to link between two MCUs or MCU and gateway and create a cascading
conference. Content can be sent across the ISDN Cascading Link.
Network Topologies Enabling Content Sharing Over ISDN Cascaded Links
ISDN Cascaded links that support content sharing can be created between two gateways, gateway-to-MCU
or between two MCUs in the following network topologies:
● Gateway to Gateway
Gateway to Gateway Topology
In this topology, an IP participant calls another IP participant over an ISDN link between two
gateways.
● Gateway to MCU
Gateway to MCU/ MCU to Gateway Topology
In this topology, an IP participant calls a conference running on an MCU via a gateway and over an
ISDN link.
ISDN Cascaded Links are not supported when the Collaboration Server is in Ultra Secure Mode. For
more information see Ultra Secure Mode.
ISDN is not supported with Collaboration Server 1800.