Polycom WEBCOMMANDER 8 - Manual (Page 146)

Chapter 5 - Monitoring an On Going Conference
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2. Type a new password (digits only), and then click OK.
Changing the Duration of a Conference
It is often necessary to manually extend the duration of a conference or
terminate a conference before its scheduled completion time. You can change
the duration of the conference either by extending the conference end time or
by setting a new end time, which lets you extend or shorten the conference
duration.
To change the conference duration:
1.
Point to the Conference Actions menu, and then click Set End Time.
These passwords also may be modified from the endpoint using DTMF codes.