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Home Phone Intercom systems? - intercom camera

I want to put an intercom system at home in my house, like hotels, but not the same. My cousins, they have in Florida, but I will not ask him. I want to also sign on the door of my house, so that when someone knocked at our door, we can talk with them through our phones and intercom unit abroad. If possible, integrate the outdoor unit into the camera, so that we can see who is at the door or turn on our television screens or through a device in the kitchen.