NEC NEAX 2000 IVS2 User Manual page 23

Lift handset to answer an outside line, ask caller to hold.
Press Boss' line. Outside line is placed on hold. The Boss hears burst of tone and Boss'
Answer key flashes.
BOSS
Hear burst of tone.
Answer key flashes.
LCD display indicates:
Option 1
Boss presses Answer and converses with Secretary.
Outside line is placed on hold.
Secretary hangs up. Boss is connected to an outside line.
Boss can alternate between the two parties by pressing Answer.
Option 2
Boss does not respond to burst of tone, Secretary presses Transfer key.
Secretary is connected to an outside line.
Option 3
Boss presses Answer and converses with Secretary.
Outside line is placed on hold.
Secretary is returned to outside line.