Polycom RMX 1500 Administrator's Manual page 218

Polycom RMX 1500/2000/4000 Getting Started Guide
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In addition, the conference running on the MGC should be set as Meet Me
Per Conference and select the H.239 option in the Dual Stream Mode field.
For more details on conference definition on the MGC, refer to the MGC
Manager User's Guide, Volume I, Chapter 5.
Defining the Dial-out Participant on the RMX
If the dialing is done from a conference running on the RMX to the
conference running on the MGC, the dial-out participant is defined in the
conference running on the RMX, setting the Cascade field to Slave. This
participant dials the Cascade-enabled Entry Queue defined on the MGC.
1 Display the list of participants in the linked conference (Slave
conference).
2
In the Participant List pane, click the New Participant (
The New Participant - General dialog box is displayed.
3
In the Name field, enter a participant name.
4
In the Dialing Direction field, select Dial-out.
5
In the Type list field, verify that H.323 is selected.
) button.