there are two ways to do it. 1 is using p2p which is more easier but a bit of speed compromised. 2 is through port forwarding. You have to coordinate it to your ISP to enable your modem into bridge mode. Then assuming you already configured your router to work with your modem as a bridge mode, you also have to configure the ports you need to open so your network can port forward to your nvr/dvr. after nun, download mo na yung windows app ng dvr/nvr mo tapos add ka ng device through IP and ports. supply those credentials and some other info needed and viola! you can now view your cctv anywhere.