Nortel Networks 2002 - Manual (Page 73)

While on an active call
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Displaying incoming call information
Use the Display feature to display a second incoming caller’s number and
name (if available) during an active call, without interfering with the call in
progress.
To view the information about an incoming call while on a call in
progress:
Tracing a malicious call
Use the Call Trace feature to trace nuisance calls within your system.
Note: This is not a default feature. Contact your system administrator
to configure this feature on your telephone.
To use Call Trace while on a call:
1. Press the Display key.
2. Press the flashing line (DN) key. The call
waiting information appears.
Note: You can use the Display key to
show status information when using
other feature keys.
Press the Call Trace key.