Chapter 2-Additional Conferencing Information
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Cascading Conferences - H.239-enabled MIH TopologyH.239 Multi-Hierarchy (MIH) cascading is available to RMX users
enabling them to run very large conferences on different MCUs in
multiple levels of Master-Slave relationships using an H.323 connection.
Multi-Hierarchy (MIH) Cascading is implemented where the cascaded
MCUs reside on different networks, whereas Star Topology Cascading
requires that all cascaded MCUs reside on the same network.
MIH Cascading allows:
• Ability to open and use a content channel (H.239) during
conferencing.
• Full management of extremely large, distributed conferences.
• Connecting conferences on different MCUs at different sites.
• Utilizing the connection abilities of different MCUs, for example,
different communication protocols, such as, serial connections, ISDN,
etc.
• Significant call cost savings to be realized by having participants call
local MCUs which in turn call remote MCUs, long distance.
MIH Cascading Levels
The cascading hierarchy topology can extend to four levels (Figure2-5)
and should be deployed according to the following guidelines:
• If an RMX 2000 is deployed on level 1:
—Only RMX 2000 can be used on level 2, and DST MCS 4000 and
other MCUs can be deployed on levels 3 and 4.
• If an MGC is deployed on level 1:
—MGC or RMX 2000 can be used on level 2, and DST MCS 4000
and other MCUs can be deployed on levels 3 and 4.
Although participants in MIH Cascading conferences can connect using H.323,
SIP and ISDN, the MIH Cascading Links must connect via H.323.