Polycom RMX DOC2579D - 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.
IP Participant
ISDN/PSTN Participant