Polycom VVXTM 1500 - Manual (Page 108)

User Guide for the Polycom VVX 1500 Phone
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The following figure shows a phone set up with two lines (1952 and 1953) that
are each assigned to a Line Key, and a third line (1954) assigned to three
Line Keys. There is one available key that is set up as a Speed Dial Key.
Supporting Shared Lines
Your system administrator can set up your phone to support shared lines. If
two phones share a line, an incoming call to that number will cause both
phones to ring. The call can be answered on either phone, but not on both.
Calls on shared lines can be transferred, put on hold, or added to a conference.
Note Shared lines is an optional feature and may not be supported on your particular
system. For more information, contact your system administrator.
Note Call Forwarding is not available on shared lines.
Do Not Disturb (DND) on shared lines disables the ringing option only. You will still
see a visual notification.