Panasonic KX-WT125 Operating Instructions Manual page 36

Operation
To set/cancel for outside calls
No Tone
Tone
To talk to the new party (While hearing the Call Waiting tone)
– To terminate the current status
– To hold and then talk to the new party
rapidly flashing Flexible CO Key [0-9,
(rapidly flashing Flexible CO Key)
OR
Disregard this step if both parties are extensions.
To page
Paging Group No. (2 digits)
Wait for an answer.
To answer
36
Call Waiting
, #]
OR
Paging
(Announce)