Look into Alphone, they have many different intercom products. I’m a low voltage electrician and could probably give you some actual companies to look into, besides Amazon.
If you have an ethernet cable out there you have quite a few choices, you could get voice/video very easily, or you can twist a few pairs together and get just voice. Truly depends exactly what you want.
Aiphone has a phone app, which can be run entirely locally which is what I prefer. Fuck cloud solutions.
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