Wes,
I was able to setup the Insteon 2684-232 R5 using the local port 34102 (changed from 34100 factory setting) and RTSP port 554 and see the video stream on the Mobilinc App while my iPhone was connected to the router network. There was no option to turn on/off the ONVIF that I could find in the setup software and the ONVIF port was already assigned as 888.
The problem is in the remote mode when the iPhone is not connected to the router network it cannot connect to the camera. I have port forwarded 34102 and 554, confirmed the ports are open, and double checked the external IP address. Any suggestions?