Polycom DOC2585A Getting Started Manual page 110

Chapter 3- Audio Only Basic Configuration and Operation
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8
The selected participants are assigned to the conference and appear
in the Participant List.
9
Select additional Participants or click the Close button to return to the
Participants tab.
To add a new participant to the conference:
1
In the Participants tab, click the New button.
The New Participant - General dialog box opens.
ISDN/PSTN Participant
IP Participant