Cordless phone (Carlingwood)

This cordless phone with answering machine is in rough shape but still somewhat functional.
Panasonic model KX-TC1871CB. Receiving calls works. Answering machine works.

Keypad on the handset is worn-out and the keys often don't respond, which makes making a call from the handset or programming the functions difficult. Not helped by the fact that contrast on the display is almost nonexistent.