Polycom RealPresence 1500 Administrator's Manual page 274

● ISDN Network Service is configured in both MCUs. For more details,
Network Service.
● Configuring a Gateway Profile and assigning dial-in ISDN/PSTN numbers. For details, see
the Gateway Profile.
● Configure the Entry Queue or conference (for direct dial-in) as enabled for ISDN connection and a
dial-in number is assigned (for example 54145106).
● Defining the dial-in ISDN participant in MCU B and Dial-out ISDN participant in MCU A (for
MCU-to-MCU cascading conferences).
A dial out ISDN participant is defined (added) to conference A. The participant's dial out number is
the dial-in number of the Entry Queue or conference running on MCU B (for example 54145106).
Polycom®, Inc.
Defining Cascading Conferences
Modifying an ISDN/PSTN
Defining
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