The project is almost completed. I have planned for further enhancements:

1. Add a camera-probably arducam

2. With full duplex audio transmission over IP (VOIP), acoustic echo is unavoidable. So working on Speex library to port to esp8266

3. Add a LIPO battery and charger for uninterrupted service.

4. Adding a proper electronic door actuator instead of a car door lock actuator

5. Adding IR support to know if the door is at latchable position.