Thanks, that is perfect !! Can i also ask if you are having any issues using the unlock buttons using FW 4.3 ?
I saw this mentioned in another post while looking for info
https://www.cctvforum.com/topic/48613-dahua-vto2000a-sip-firmware-and-asterisk/?page=12&tab=comments#comment-302155
This is very interesting. I am happy to hear that you got this working. I have been trying to do the same thing and have not been able to get it working.
Could you I ask if you would share the config settings that you used on the VTO?