Q: I want to operate the camera via a 3G / UMTS router without fixed IP address ...
A: Yes, in this case you can access via P2P via e.g. our smart phone app. With DDNS, access to a mobile Internet connection is unlikely to work, so you would have to switch to the P2P connection. P2P is the IP address that has the camera in the network or even the router on the Internet does not matter. This access will always work. The only drawback is that you always need a terminal, such as our app for your smart phone. One can, for example, Do not access the camera via the web browser while on the move as you can with DDNS. At P2P, you always need a connection setup software, such as our App InstarVision.