I have read most of the topics here.. Consider this simple solution. I have an insteon camera pointed at mt front door with a mic and speaker connected to it. I also have a button (doorbell button)connected to my insteon system that sends me a sms when pressed. I can initiate a one way video conference with the guy at the door with the camera. One way meaning I can see him but he can not see me. Who knows I may be in my underwear!
Might as well try it to know the outcome lol By the way, how much did you spend for all of those? Is the insteon system a one time paid account or subscription?