I am on the opposite ends, familiar with Axis 7216 but new to
Blue iris.
Try to pull the rtsp stream from the P7216 if Blue iris pull rtsp streams.
rtsp://<camera ip>/axis-media/media.amp?camera=<n>
where n is the port/channel number.
P7216 has 4 IP addresses. Each IP addresses has 4 ports/channel for 4 analog cameras.
If you are interested in further discussion, please contact me via Skype @ Cheng.Xin.SG