Nortel Networks 2004 - Manual (Page 74)

While on an active call
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To retrieve a parked call:
4. Choose one of the following.
— Press the Transfer soft key.
— Press the Conference soft key.
1. Lift the handset.
2. Press the Park soft key.
3. Dial the DN where you parked the call.
Note: If a parked call is not retrieved
within a specified period of time, it rings
back to your telephone or to the
attendant.
or