Polycom VVXTM 1500 - Manual (Page 170)

User Guide for the Polycom VVX 1500 Phone
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Using the Busy Lamp Field
The BLF feature allows you to monitor a line on another phone so you can tell
if the other line is idle or busy (has an active call). The lines you can monitor
display under your phone’s Line Key(s). The number of lines you can monitor
is determined by the number of lines your phones has. For example, if your
phone has one line assigned to one Line Key, then you can monitor up to five
other lines.
The following table shows the BLF icons and status indicators that display
when you monitor a line on another phone.
The following figure shows two remote lines. Line 1953 is idle and Line 4002
is busy.
Note Busy Lamp Field (BLF) is an optional feature that your system administrator sets
up. Your system may not support it.
BLF Status Line Key Icon Status Indicator
Idle (No indicator)
Busy Solid red