Telephone Handset Connector What Model Panasonic Telephone Handset Is Compatible With A Base Model No. KX TG 5571CM ?

What model Panasonic telephone handset is compatible with a base model No. KX TG 5571CM ? - telephone handset connector

There are many models of Panasonic mobile phones for sale online, but there is no model No. KX TGA 550cm. This is the phone that I currently have. I want to see another phone to my phone system.

I wonder if other mobile phone models are supported. My review of sites that will help me understand certain things, whether or not changed.

Thanks for your advice on this point.