If you want to use the phone or computer to connect the system, p2p status must be online like the picture below.
If it is offline, please check the setting and connection.
1. Please make sure NVR is connected to the router by network cable.
2. Please make sure you are using the WAN port instead of the LAN port on NVR to connect the router.
3. Please follow the below picture to check the network settings of the system: