Panasonic KXTD612NE Operating Guide

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2.4
During a Conversation
80
Operation
 To talk to one party by disconnecting the other when one of these parties is an 
outside call
 Leaving a conference
The other two parties can continue their conversation.
 To return
Customising Your Phone
Create or re-arrange a Conference button.
Press CO or 
INTERCOM.
DPT
Talk.
C.Tone   
OR
(CO)
DPT/SLT/ISDN Extn.
DPT
On-hook.
Press CONF.
Some extensions may be restricted 
from performing this function.
When you are talking with two extensions or
one extension party and one external party
When you are talking with two external parties
(Unattended Conference)
Press CO.
DPT
While the others are talking
(CO)