To help the community, I want to mention that I have placed 3 of these in 3 different areas of my house, meaning 3 bases and 3 headphones. So, is there a way for these 3 to be registered to one base (the most logical would be the one in the middle of the distance) and communicate with each other internally? The process is relatively simple, you can find it online.
From what I saw, it can be done up to 3 pieces, tested, I don't know about more, I think not. The other 2 bases are now only plugged into the socket (not the telephone socket) and are only used for charging the respective headphones.
Also, I want to mention that their range covers at least 2 or 3 floors.

So far, it does its job exceptionally well. The menu is initially in Spanish... but it can be easily changed. It also appears to be durable against falls

Very bad. The color won me over. The menu is in Spanish. The ringtone sounds are unacceptable, annoying, and not at all melodic. And the most important thing is that the sound is NOT LOUD enough when it rings, resulting in it not being heard in a closed-door room. I am very disappointed.

Value for money, guys. The only downside is that it's not durable as a construction, meaning it's not meant for many falls. For its price, it's a good wireless device for home use. Very good range, screen sound, lighting, simple menu (although outdated), large screen, etc. It was replaced because it broke after 10 years (a120) of the same company.

The reason I only put one star is because its intensity is overwhelming. I bought it for professional use in a noisy store. You need to use your imagination to understand how powerful it is.

He writes that there is an open hearing.... of course it doesn't exist!!!! The battery is terrible. After 1 year, I'm looking for another device!! Unfortunately!!!

UNACCEPTABLE. The ringtone is ridiculously low. You have to be within half a meter to hear it. At the service, they told me with a smile that if I wanted a louder sound, I should get another phone!!!! They opened a second device, brand new, and the sound was the same. So we are clearly talking about a defective model from Gigaset..... and on the box it says Made in Germany.... unbelievable..... Money wasted........ STAY AWAY

The only disadvantage is that one does not communicate with the other between the 1st and 3rd floor. With just a difference of one floor (1st to 2nd or 2nd to 3rd), everything is fine. However, for its price, it is perfect.