Hi Saifuddin,
You have to bind a analog line directly to the DN respectively button on the phone. Below an example:
voice-port 0/0/0
trunk-group FXO_ALL
connection plar opx 5001
caller-id enable
dial-peer voice 1000 pots
destination-pattern 1000
port 0/0/0
ephone-dn 1 dual-line
number 5001
label Line1
trunk 1000 monitor-port 0/0/0
ephone 1
mac-address nnnn.nnnn.nnnn
type 7965
button 1:1
Regards
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