Panasonic KX-TD7696 Operating Instructions Manual page 36

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