User's Manual
Chapter 5-Cascading Conferences
Polycom, Inc. 5-35
Method II
Depending on the dialing direction, the following procedures must be performed:
Setting Flags on the Collaboration Server
When running conferences in mixed environment (Collaboration Server and MGC) there 
may be small differences between the line rates each MCU is sending. In the 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 Collaboration Server.
To modify the flags:
1 In the 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 
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 18432Kbps to 
Table 5-4  Set up Procedures according to the Dialing Direction
Dialing 
Direction
MGC Level 1
RealPresence Collaboration Server 
(RMX) 1500/2000/4000
Level 2
MGC to 
Collaboration 
Server
Set the appropriate flags (done once 
only).
Set the appropriate flags (done once 
only).
Define the cascade-enabled Entry 
Queue, setting it as Slave.
Define the conference setting and 
its line rate to be the same as the 
one set on the Collaboration Server.
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 Collaboration Server.
Collaboration 
Server to MGC
Set the appropriate flags (done once 
only)
Set the appropriate flags (done once 
only)
Define the cascade-enabled Entry 
Queue.
Define the conference setting and 
its line rate to be the same as the 
one set on the Collaboration Server.
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.










