Do I need a bell transformer in order to make GDX Intercom Handset to work?

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Hello All,

I have a GDX Audio door Handset.

It is connected to intercom of a building. The building has 3 floors and 8 flats all together.

The previous owner cut the wire that connects to the the building door intercom from the GDX handset.

My question is this:
I was wondering if it is just to find the wire and connect it to the GX Handset or do I need to have a bell transformer too?
Is the GX handset is already has electricity from the intercom somehow?
Something like this:

Thanks for all your replies in advance.

GDX 23150 Wired-1.JPG

GDX 23150 Wired-2.jpg

GDX 23150 Wired-3.jpg
 
Last edited:
Needs re connecting ….this system may have a controller and MAY …. be fused …are you renting or do you pay a service charge ?
 
Do you pay a service charge for upkeep on communal areas ? As the intercom may be part of it
 
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