NEC DS1000 Feature Handbook page 22

Central Office Calls, Placing
To place a call using a line or loop key:
1. Press the key.
2. Dial the outside number you want to call.
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The key will light green and you'll hear dial tone
from your outside line.
You may have a Private Line that is only on your
phone. Check with your Communications Manager.
Toll Restriction may prevent you from dialing cer-
tain outside numbers.
If you use a dial pulse line and wait 6 seconds
after dialing a digit, the system outdials any remain-
ing digits as DTMF.