Panasonic KX-NCP500 User Manual page 48

PT/SLT/PS
Off-hook.
Press red DSS, PDN, or SDN,
or dial extension number.
PT/SLT/PS
Off-hook. Dial extension
number.
(DSS)
OR
(PDN)
OR
B.Tone
(SDN)
OR
extension no.
extension no.
DND Tone
5
C.Tone
Enter 5.
1
R.B.Tone
Enter 1.
Monitoring starts
Talk.