The question re integrating IP cameras has been asked previously, however, not fully answered.
After some messing around I've finally managed to successfully integrate a Grandstream GXV3610FHD camera in Loxone. Despite previous comments to the contrary it is possible to use Loxone's own DNS service.
Steps:
1. Connect IP camera to your home network and assign a static IP address.(The camera will be assigned port 80 by default)
2. Configure port forwarding on your router. I was advised to assign a port logically to keep things in order. So if the IP address is xxx.xxx.1.180, assign port 8180 (for example).
3. Select the door controller function block and in its config properties:
URL video stream(local) add "http://[IP address]:[port number]/goform/stream?cmd=get&channel=4"
URL video stream (external) add "http://clouddns:[port number]/goform/stream?cmd=get&channel=4"
For info, channel=4 is the camera's secondary MJPEG stream as Loxone does not support the camera's H264 primary stream.