Resolving Network Link is Down Phone Connectivity Issue
1. Check the physical connections.
These include the power cables and ethernet cables. Ensure hat the cables are snugly fit into the correct ports on the Polycom Phone and on the router. Also, check if the wires are not broken on both ends.
• On the Router / modem / switch, the Ethernet cable should be connected to the Ethernet ports.
• On the Polycom phone, the Ethernet cable should be connected to the LAN port.
2. Restart your network devices
Unplug the power cable from your network devices (modem, router, switch, and phone), and then plug the power back in the proper order, starting from the device closest to the wall (modem > router > switch > phone).