Panasonic 8EXT/4CO Digital Super Hybrid Phone System KX-TD81 (Ottery St Mary EX11)

Used Panasonic 8EXT/4CO Digital Super Hybrid Phone System KX-TD816E + one KX-T7235E system handset

The KX-TD816E relies on traditional analog trunk lines (CO lines) or ISDN circuits.
To connect it to a fibre setup, you must plug an ATA / FXS Gateway (such as a multi-port FXS gateway or the telephone port of the router if configured) into the analog trunk/CO ports of the Panasonic system.
Internal Extensions Remain Unaffected: Inside your premises, any existing Panasonic digital/analog proprietary phones (like the KX-T74xx or KX-T72xx series) and single-line devices connected to the KX-TD816E will continue to operate normally.