Polycom RealPresence 1500 Administrator's Manual page 299

Set up Procedures according to the Dialing Direction
Dialing
Direction MGC Level 1
RealPresence Set the appropriate flags (done once only)
Collaboration
Define the cascade-enabled Entry Queue.
Server to MGC
Define the conference setting and its line
rate to be the same as the one set on the
RealPresence Collaboration Server.
Setting Flags on the RealPresence Collaboration Server
When running conferences in mixed environment (RealPresence Collaboration Server and MGC) there may
be small differences between the line rates each MCU is sending. In the RealPresence Collaboration
Server, several flags must be set to ensure that these differences will not cause the cascaded link to connect
as Secondary and that Content flows correctly between the cascaded conferences. This procedure is
performed once per RealPresence Collaboration Server.
To modify the flags:
1 In the RealPresence Collaboration Server Web Client menu, click Setup > System Configuration.
2 In the System Flags dialog box, add the following new flags and values:
 MIX_LINK_ENVIRONMENT=YES
Setting this flag to YES will adjust the line rate of HD Video Switching conferences run on the
RealPresence Collaboration Server 1800 from 1920Kbps to 17897Kbps to match the actual rate
of the HD Video Switching conference running on the MGC. In such case, the conference can
include IP and ISDN participants.
 IP_ ENVIRONMENT_LINK=NO
If the flag MIX_LINK_ENVIRONMENT is set to YES, the IP_LINK_ENVIRONMENT flag must be set
to NO.
If the flag MIX_LINK_ENVIRONMENT is set to NO, the IP_LINK_ENVIRONMENT flag must be set to
YES.
 H263_ANNEX_T=YES (default)
This flag enables/disables the use of Annex T with H263. Set it to NO if the endpoints connecting
to the conference do not support this mode. In such a case, you must also change the MGC flag
ENABLE_H239_ANNEX_T setting to NO.
 FORCE_1X1_LAYOUT_ON_CASCADED_LINK_CONNECTION=YES (default).
Set this flag to NO If the MGC is functioning as a Gateway and participant layouts on the other
network are not to be forced to 1X1.
Polycom®, Inc.
Defining Cascading Conferences
RealPresence Collaboration Server (RMX)
1500/1800/2000/4000 Level 2
Set the appropriate flags (done once only)
Define the conference setting and its line rate to
be the same as the one set on the MGC.
Define the dial-out participant (Cascaded Link) to
the conference running on the MGC, setting the
participant Cascade parameter to Slave.
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