solidity

Hello, I'm very interested by a VTO2000A from Aliexpress. I read some posts in this thread and I would like confirmations... - It needs a special firmware to use SIP ? - If I have a SIP Phone which can handle SIP VIDEO (like GRANDSTREAM GXV3240) is the video will work ? - In parallel, I would like to handle the video stream in my Surveillance Station system, is it working too ? Which protocol is it ? - Is the VTO2000A is PoE compliant or not ? 802.3af/at ? Thanks for your help !