Panasonic KX-NS1000 - 2.11.4 Headset Operation

Feature Guide References
2.1.3.3 Call Waiting
User Manual References
1.2.4 When the Dialled Line is Busy or There is No Answer
1.9.3 Receiving Call Waiting (Call Waiting/Off-hook Call Announcement [OHCA]/Whisper OHCA)
152 Feature Guide
2.10.4 Second Call Notification to Busy Extension