To leave the conversation and then let the two parties talk
PT/PS
Press DSS or dial the other 
party's extension number.
Talk to the 
other party.
During a conversation
Press TRANSFER.
extension no.
OR
(DSS)
Press TRANSFER.
C.Tone
On-hook.
SLT
Dial the other party's
extension number.
Talk to the 
other party.
During a conversation
Press Recall/
hookswitch.
extension no.
OR
C.Tone
On-hook.
Press Recall/
hookswitch.
OR
1.4.4  Answering Call Waiting
–  Answering Call Waiting in the PBX
–  Answering Call Waiting from the Telephone Company
 Answering Call Waiting in the PBX
During a conversation, a call waiting tone or voice announcement through the speaker or the handset
occurs when an outside call has been received or another extension is letting you know a call is waiting. You
must activate this feature to use it. (Default: Disable—No call [Intercom calls]/No tone [Outside calls])
You can answer the second call by disconnecting (1) or holding (2) the current call.
1. To disconnect the current call and then talk to the new party
PT/SLT/PS/KX-UT series/S-PS
While hearing a tone
Off-hook.
On-hook.
Talk to the 
new party.
1.4.4 Answering Call Waiting
Operating Manual 73