Extension bells on a landline

[#1]

Asking for somone else. Rather old stuff.

Any alternatives when they are VoIPed?

[#2]

They usually appear to be a phone.

Subject to the ability to provide ringing to the number of devices of the VoIP adaptor, in principle an extension bell should continue to work.

https://en.wikipedia.org/wiki/Ringer_equivalence_number

Modern phones tend to have a REN less than 1 so depening on the setup, connecting the bell into the "phone" connection of a VoIP adaptor may well work.

[#3]

@grumble 

Buy a cordless phone with multiple handsets. Much less hassle!

[#4]

I fear I may have not phrased the whole.

The aforementioned extension bell is on the outside of a property, and is therefore subject to things like normal (ish) external UK weather.

[#5]

P.S. I did trundle through Amazon and found stuff that may operate whilst isolated from external weather