Panasonic KX-TEB308 - Manual (Page 104)

2.1 Control Features
104 User Manual
To confirm
Off-hook.
On-hook.
Enter 764. Dial extension
number.
Display PT
extension no. 6 4 7
Enter #.
Enter 763 .
7 6 3
D.Tone
C.Tone
& D.Tone
Enter #.