House phone integration to door intercom

Ideas & Suggestion
1

I have a door entry system that when you ring the front door intercom it rings all of the landline phones in my house. So, if you have 5 landline phones, these will all ring & you would only have one wire to the master phone socket from the door intercom..

2

Hi, can you elaborate a little more on what panels and devices you have and what your idea is for implementation?

3

This is the one i have, thats been fine for the last 10 years, But i think they have stopped making it.
BELLTONE 901.pdf (78 KB)
BT901 (1).pdf (136.4 KB)

4

and what do you want to do? I did not understand the purpose of your question. and possible connection ewelink

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