NEC 5140 - Manual (Page 24)

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Call Pickup
To answer a call that is ringing at another extension in your Pickup
Group:
1. Lift the handset.
2. Press the Pickup Call command key.
(See Quick Key Programming for instructions on programming features to
your phone.)
To answer a call that is ringing at a extension not in your Pickup
Group:
1. Lift the handset.
2. Dial **6.
3. Dial the number of the ringing station.
Campon
To Campon to a busy station:
z
Press the I Will Wait command key.
To retrieve a call when you hear Campon tone:
1. Press the Call Waiting command key.
2. Press the Trade Calls command key.