Nortel Networks SoundPoint IP 550 - Manual (Page 45)

Customizing Your SoundPoint ® IP 550 Desktop Phone
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Supporting Shared Lines
Your SoundPoint IP 550 supports shared lines.
A shared line is indicated by a different line icon. In the following figure, the
lines 3161 and 3163 are private and the line 3166 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.
Do Not Disturb (DND) on shared lines disables the ringing option only, the visual
indication is still in place.