Panasonic KX-TD500 System Reference Manual page 131

Hardware Setting
You can choose one of the following E&M sequences using the hard switch on the KX-T96184.
KX-T96184
Hard switch
(1)Continuous E&M
Seize
E-Wire
Wink
M-Wire
1 2 3
)
(ON/ON/ON
1 2 3
)
(OFF/ON/ON
1 2 3
)
(ON/OFF/ON
1 2 3
)
(OFF/OFF/ON
1 2 3
)
(ON/ON/OF
1 2 3
)
(OFF/OFF/OFF
Dial
if you select "Immediate" this signal would not appear.
2-C-53
Hard Switch
1
O
(ON)
F 2
(ON)
3
(ON) F
(Default)
(1) Continuous E&M (Wink/Immediate)
(2) Pulsed E&M with Answer signal (Wink)
(3) Pulsed E&M without Answer signal (Wink)
Reserved
Answer Disconnect