Panasonic KX-NCP500 User Manual page 74

1.4.3 Talking to Two Parties Alternately (Call Splitting)
SLT
During a conversation
OR
C.Tone
Press Recall/
hookswitch.
74 User Manual
extension no.
Dial the other party's
extension number.
OR
Talk to the
Press Recall/
hookswitch.
other party.
On-hook.