V Tech cordless landline system not dececting landline

[benjamin91609]

My V Tech landline system that I had since 2016 now will not detect my line the display says "No Landline Connected" but when I get a call it works like normal but it does not ring Plz Help Me!

 

[hang-the-9]

This is a bit confusing, if it's not ringing how do you know it's working when you get a call? Can you call out on it?