Polycom Viewstation 128 User Manual page 22

Getting Started
Telephone Numbers
On the Telephone Numbers screen, enter the number of the telephone that may
be connected to your ViewStation. Also enter the number to another telephone
in the same room as the ViewStation.
Main Calling Screen
Every time you turn on your ViewStation, you will see a numbered icon below
the Video Call icon on the main calling screen. It indicates that the ViewStation
is making sure your ISDN line is connected. When the icon turns green, the
ViewStation has found your ISDN line. If the icon changes to red, the
ViewStation was unable to find your ISDN line. In this case, check your ISDN
connection and verify that you entered the ISDN numbers correctly and that
they correspond to the appropriate ISDN line
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ViewStation User's Guide