Panasonic 44-Series User Manual page 57

5. Communicating Within Your Office
The camp-on feature alerts you when a busy extension is free.
1. Pick up the handset or press ON/OFF.
2. Dial the extension number.
3. When you hear a busy tone, press 3.
4. When you hear a ringing tone, replace the handset or press ON/OFF.
Your extension rings when the busy extension becomes free.
DBS-32-755 Issued April 2000 55