Polycom Viewstation 128 User Manual page 32

Placing and Answering Calls
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Once the third party connects, press the NEAR or FAR button on the remote
to return to the videoconference. If you only hear the numbers being dialed
and no one ever picks up on the other end, make sure that you have an
analog phone line properly connected to the back of the ViewStation. See
your QuickStart booklet for more information.
To disconnect from the third party, press the CALL•HANG-UP button on
the remote. Then highlight the Disconnect Speakerphone Call icon and
press the SELECT button on the remote.
ViewStation User's Guide