bell 801

Old video intercom from Bitron need to change to a simple Bell 801. I got some old connecting photos and the existing cable is 12 cores type. I try to connect it to new simple intercom it’s a bit tricky. I searched few posts in forum but didn’t help. High appreciated if anyone can give me advice

Hi all, Recently moved into a flat that had a very old Urmet intercom handset. We replaced it with a Bell 801 handset and was all fine for a while, buzzer and everything worked. Recently developed an issue where a very loud feedback noise can be heard when the handset is picked up. Can still...

Hi I am trying to replace a entel 300 door entry telephone with a bell 801 entry telephone I bought from amazon the wiring for the entel 300 is below 10v orange + white 0v white + orange C1 white +blue C2 blue + white On the bell 801 it has markings I R O T Z I have no idea which...