I have a Hikvision NVR and some Hikvision cameras.The router gave me an ip for the NVR. I put it in my pc browser and appeared the login Hikvision interface. When I was at a friend with a different provider of internet I couldn't reach my NVR via IE. I have a static IP from my provider.So this I must put it in the browser at my friend, not the ip given to me by the router?