Panasonic KX-NS500 User Manual page 82

1.4.4 Answering Call Waiting
SLT
While hearing a tone
Press Recall/hookswitch.
KX-UT113/KX-UT123
While hearing a tone
C.Tone
Press HOLD.
KX-UT133/KX-UT136/KX-UT248/KX-UT670/S-PS
While hearing a tone
C.Tone
Press HOLD.
After talking to the new party (second call), you can disconnect (2.1) or hold (2.2) it and then retrieve
the first call.
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Enter
50.
Talk to the new party.
(DN)
OR
(S-CO)
Press the flashing DN,
or S-CO.
C.Tone
Talk to the
new party.
Talk to the new party.