Panasonic KX-TD500 System Reference Manual page 522

Operation
Establishing a Conference-One Appearance
Extension A is having a conversation with party B
(another extension or an outside party on the DN
button).
The following is the operation from the standpoint
of extension A.
1. Press the CONF button.
• The indicator on the CONF
button starts flashing in red 60
wink.
• The other party B is placed on
Consultation Hold. Extension A
hears dial tone 1, 3, or 4.
2. Call another party C (an extension
or an outside party).
• Talk to station C on the DN
button.
3. Press the CONF button.
• The indicator on the CONF
button lights in red, conference
among the parties A, B and C
on the DN button is established.
(Supplement)
Pressing the TRANSFER button is available
instead of pressing the CONF button in step 1.
In this case, the indicator on the CONF button is
off in step 1, then in step 3 it lights in red by
pressing the CONF button.
To change the conference member after step 2,
press the FLASH button and execute step 2
again.
Concluding a Conference-One Appearance
1. Replace the handset or press the
SP-PHONE button.
• If both B and C are outside
• If both B and C are extension
(Supplement)
If the conference originator presses another DN
or CO button during a conference, the originator
seizes the line on the pressed button and leaves
the conference. The remaining two parties are
treated in the same way as if the originator
concluded the conference by replacing the
handset or by pressing the SP-PHONE button.
4-G-6
parties, both parties are
disconnected.
users, or either of them is an
extension user, a conversation
between B and C is
established.