Polycom MGC Manager User Manual page 334

Chapter 7 - Attended Conferencing
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Click Yes to attend a participant that was placed on hold. Click No to
leave the participant on hold in the Participants Queue.
To place a participant On Hold:
In the Attended Participant window, click the Hold button.
•
Alternatively, press the selected shortcut key combination as it appears
on the Hold button (the default shortcut key is <F4>).
When you place a participant on hold who is the last participant in the
Participants Queue, the following message appears:
Click Yes to attend a participant that was placed on hold. Click No to
leave the participant on hold in the Participants Queue.