Nortel Networks 6.1 - Manual (Page 247)

General System features / 247
P0603544 02 Compact ICS 6.1 System Coordinator Guide
Prime line
Your telephone can be programmed to select an internal or external line or
a line pool automatically whenever you lift the handset or press the
handsfree button. This is your prime line.
Private lines
A private line is exclusive to a particular telephone. Calls that are put on
hold or left unanswered on a private line cannot be picked up at any
telephone except the prime telephone.
Volume bar
The volume bar controls the volume of the handset, telephone ringer,
handsfree speaker, and headset. Press either end of the volume bar
à to adjust the volume.