Samsung SmartCam: SNH-V6435DN API for two-way audio

I have a SmartCam D1 Video Doorbell (SNH-V6435DN) with firmware version 1.04_180309. I wonder whether the device has an API to send audio packets to it so that I can write my own program to do 2-way talk? The video and audio coming from the camera will be through RTSP URLs.

Thanks in advance!