Panasonic KX-NCP500 User Manual page 204

PT/SLT/PS/SIP Extn.
Off-hook.
#
Enter #.
Enter same extension PIN
(max. 10 digits).
PIN: Personal Identification Number
7 9 9
Enter 799.
same
extension PIN
extension PIN
1
Enter 1. Enter extension PIN
(max. 10 digits).
#
C.Tone
Enter #.
On-hook.