vto2000a video sip h264

Hi! I recently installed a VTO2000A at my house' door runnning a modified version of the latest SIP firmware (General_Overseas_VTOXXX_Eng_P_16M_SIP_V1.000.00.0.R.20170425.bin). I hooked up the device in my astersik server (11.13.1~dfsg-2+deb8u5) and I am able to make SIP video calls from and to...