Panasonic KX-NS1000 User Manual page 207

1.9.14 Clearing Features Set at Your Extension (Extension Feature Clear)
PT/SLT/PS/SIP Extn.
7 9 0
C.Tone
On-hook.
Off-hook. Enter 790.
•
For Users in Canada Only:
After performing Extension Feature Clear, the setting of Call Waiting becomes "Enable
(Tone)". In this case, dial tone 2 will be heard when you go off-hook.
User Manual 207