9
Troubleshooting
3
Symptom
Corrective Action
Display is blank
•
Ensure your Ethernet cable is plugged into the WAN port on
the back of your phone.
•
Ensure the POE switch is properly configured. If it still
doesn’t work, replace the Ethernet cable.
Phone is not
receiving a DHCP
IP Address
1. Ensure your DHCP server is online.
2. Reboot the router or DHCP server.
3. If you are still experiencing issues, the phone may require
advanced network configuration. Please contact your
administrator or refer to the FON-C75 User Guide.
No name and
extension number is
displayed
Your phone is not registered.
1. On the Extension page of the FortiVoice interface, ensure
the MAC address is correctly entered and the Phone Type is
FON-C75. Save your configuration and reboot the phone.
2. If your phone is configured as an external extension, ensure
the Provisioning Server is correct. To verify, see “For use as
an external extension”.
3. If your phone is configured as an external extension,
check the network connection and firewall settings at the
FortiVoice location.
No audio during
a call
1. Make sure the phone is properly registered with the
FortiVoice.
2. If your phone is configured as an external extension,
check the network connection and firewall settings at the
FortiVoice location.
