OpenEye CM-816 - Manual (Page 29)

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There are some challenges with connecting to OpenEye IP cameras over WAN
(internet) connections because the camera streams video over RTSP. RTSP is an
excellent protocol for media and is now used on many IP cameras (including OpenEye)
as the default streaming option.
RTSP, however, is not suitable for transmission between two locations that are behind
different routers. In this case, the client (for example, the OpenEye HVR or NVR server
software) connects to the camera, and then requests a stream. The camera uses that
connection to return a stream, but since the connection originated on the client side and
has now switched to the camera (remote) side, the router does not have any way to
determine where the traffic should be routed, so no video appears at the recorder. There
are three solutions to this.
1. Connect modems on both sides directly to the recorder and camera. If there is
no router, no network address translation is needed.
2. Use routers with VPN support and set up a small VPN. Once this is done, the
traffic will be treated as though it were all on the local network.
3. (Best solution) – Use routers with connection tracking . This is quite easy;
VOIP also uses RTSP and faces the same challenges. If a router is marketed
as having “VOIP Support”, it will have the necessary connection tracking
capability to allow any type of RTSP communication (not just VOIP).
With proper planning and the correct equipment, RTSP cameras CAN stream over the
WAN to a recording device for minimal additional cost and labor.
Please contact OpenEye support if you require any additional information on these
topics.