Polycom RealPresence 1500 Administrator's Manual page 596

a Click the appropriate table entry in the Message File column.
A drop-down list is enabled.
b From the list, select the audio file to be assigned to the event/indication.
If the Tones option is enabled, you must assign the appropriate audio files to all notification types.
The Collaboration Server system is shipped with two default tones: Entry_tone.wav and
Exit_tone.wav.
If required, you can upload customized audio files that will be played when participants join or leave
the conference.
If the option to play a tone when a cascading link connection is established, make sure that the tone
selected for Entry or Exit notification differ from the cascading link tone as the latter one cannot be
customized.
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