Panasonic KX-TCA255 Operating Instructions Manual page 36

Feature List
Feature
Call
Waiting
36
Useful Features
❑
KX-TDA100/200
To set/cancel for intercom calls
7
To set/cancel for outside calls
7
❑
KX-TD816/1232
7
(Check the type of your Main Unit.)
To talk to the second party
While hearing a call waiting tone
Operation
0
1
1
0
2
1
1
Set
1
Cancel
0
OR
No call
Set
No tone
Tone