How to display which extension no. Calling I have panasonic ns300 epbax analog betel m59 landline phone

[vivthakur9 (viv)]

How to display which extension no. Calling I have panasonic ns300 epbax analog betel m59 landline phone

[mcgrathr (Mc GRATH Ricardo)]

@vivthakur9

analog betel m59

How it is interconnected Panasonic NS300 with FreePBX?