Methods and systems in accordance with the present invention provide a Bluetooth, wifi or other wirelessly connected door answering system. This system may include a Bluetooth or wifi device, for example, which may be affixed to or near a door and is enabled to communicate with a software application...http://www.google.com/patents/US20120149344?utm_source=gb-gplus-sharePatent US20120149344 - Method and System for Remote Notification and Answering of a Visitor at a Dooor
