Im a newbie to home automation, Our 8 unit building has a door buzzer entry system with keypads in each unit. 3 buttons Listen, Talk, and Door (opens exterior door). There is also a speaker. I would like to operate this with my smartphone. Is there a solution in your product set? I have wireless IP gateways I can use. Full functionality would be great. Talk and Listen must be pressed and held. Minimum functionality would be to hear or feel the speaker when it buzzes (5v). Notify the smartphone and engage the door open button from the spartphone.