Polycom WEBCOMMANDER 8 - Manual (Page 126)

Chapter 5 - Monitoring an On Going Conference
5-50
To define a new T1-CAS participant during an On Going conference:
1.
Point to the Conference Actions menu, and then click New Participant.
Alternatively, click the New Participant button from the Meeting
Director toolbar.
For users with the View Mode - Basic (Permission Properties - General)
Different fields are enabled for Video and Audio Only participants.