Polycom IP 320 - Manual (Page 36)

User Guide SoundPoint IP 330/320
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Supporting Multiple Line Keys Per Line
Each line on the phone can be configured to have more than one Line Key
associated with it. This enhances call visualization and simplifies call
handling. If this is the case, the display could resemble the following figure:
Incoming calls to this line will be distributed evenly among the available Line
Keys. Similarly, outgoing calls will be distributed.
The SoundPoint IP 330/320 combines the call appearances for multiple line
keys into a single call list.
The line key that a call belongs to is indicated by the reverse colored icon.
Supporting Shared Lines
Your SoundPoint IP 330/320 phone supports shared lines. A shared line is
indicated by a different line icon. In the following figure, the line 3413 is
private and the line 3416 is shared.
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 both.
Calls on shared lines can be transferred, put on hold, or added to a conference.
Note Shared lines are 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.