NEC DS1000 - Manual (Page 193)

To queue for a busy line:
1. Press line key for busy line.
OR
Press and dial the line’s Direct Line Access code
(e.g., 101 for line 1).
2. Dial ; do not hang up.
3. When the line becomes free, you automatically connect.
When you hear dial tone from the line, you can
place your call again.
To leave a Line Callback for a busy line:
1. Press line key for busy line.
OR
Press and dial the line’s Direct Line Access code
(e.g., 101 for line 1).
2. Dial or press , then hang up.
3. When the line becomes free, the system automatically
calls you back.
If you answer within 4 rings, you hear dial tone
from the outside line.
If you don’t answer the Callback ring, your phone
system cancels the Callback.
CLBK
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Trunk (Line) Queuing and Callback
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