Panasonic KX-TDA50 Operating Manual page 49

2.1 To disconnect the second call and then talk to the original party
PT/PS
During a conversation
On-hook.
PT/SLT/PS
During a conversation
On-hook.
Document Version 2008-10
(CO)
(ICD Group)
Off-hook.
INTERCOM
Press CO, ICD Group, PDN,
SDN, or INTERCOM.
Off-hook.
Enter
OR
OR
(PDN)
OR
Talk to the
(SDN) original party.
OR
5 0
C.Tone
Talk to the
50.
original party.
1.3.12 CALL WAITING FEATURES
Operating Manual 49