Polycom RealPresence 1500 Administrator's Manual page 594

a To enable the Roll Call feature, select the Enable Roll Call option.
b Select Enable Tones to enable the Tone Notifications option.
The dialog box changes to display the tone notification options.
c Select None to disable the Roll Call and Tone Notifications features.
20 If you enable the Roll Call option, assign the audio file to the message type in the Message File
column, and click the appropriate table entry.
An arrow appears in the Message File column.
If the Roll Call option is enabled, you must assign the appropriate audio files to all message types.
21 Click the arrow to open the Message File list and select the appropriate audio file.
Polycom®, Inc.
IVR Services
564