Polycom realpresence 1800 Administrator's Manual page 620

 Roll call review is possible.
If Roll Call is enabled, when a participant joins or leaves a conference, the system plays a voice
message to all participants. The audio message consists of the joining or leaving participant's Roll
Call name followed by either "has joined the conference" or "has left the conference".
These voice messages can be replaced with audio tones. The use of tones requires that the
appropriate tone files in *.wav format be uploaded and configured to replace the Roll Call
Joined.wav and Roll Call Left.wav message files.
22 If you enable the Tone Notifications option, select the Entry Tone or Exit tone.
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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