I have new idea for my home automation. I want to create a 2-way communication when someone press my home doorbell (which is already integrated into HA). I plan to put a Bluetooth speakerphone at the door and link it to an Android phone/tablet that is placed indoor. When someone press the doorbell, HA will trigger the automation to publish an MQTT topic similar to Send SMS format in Zanzito. Zanzito will then call my SIP based number as per the topic so that I can talk to the person at the door.
Is that possible?