Poly VVX 300 and VVX 400 Phones Unable to Connect to Network

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Symptom

When connecting Poly VVX 300 and VVX 400 phones to a gigabit network, the phone does not connect. The phones may display "Line Unregistered," and the time and date are out of sync.

Applies To

Poly VVX 300 and VVX 400

Resolution

Set LAN Speed to 100FD in Phone Admin Menu

To change both LAN port and PC port speeds to 100 FD (full duplex)L

On the phone, go to Menu > Settings.
Select Advanced.
Enter password.
Select Administration Settings.
Select Network Configuration > Ethernet Menu.
Scroll down and select LAN Port Mode.
For the Speed Setting, select 100FD (100 mbps Full Duplex).
Go back to the Ethernet Menu and select PC Port Mode.
For the Speed Setting, select 100FD.
Return to the main menu. You will be prompted to Save the configuration and reboot the phone.

Cause

Poly VVX 300 and VVX 400 phones are not rated to gigabit speed, so they cannot use that connection speed. These phones are designed to auto-negotiate, but this does not always happen.

Note: If the phone gets a DHCP IP address, this is a separate issue.