Panasonic KX-WT125 Operating Instructions Manual page 36

Operation
To set/cancel for outside calls
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
Disregard this step if both parties are extensions.
To page
Wait for an answer.
To answer
36
Call Waiting
No Tone
Tone
rapidly flashing Flexible CO Key [0-9,
OR
(rapidly flashing Flexible CO Key)
OR
Paging Group No. (2 digits)
Paging
, #]
(Announce)