Troubleshooting 14 FortiFone™ QuickStart Guide
Troubleshooting
Symptom Corrective Action
Nothing showing
on the LCD
1. Ensure the power adapter is plugged in.
2. Check/replace AC/DC adapter.
3. Check/correct input power from the LAN if using
PoE.
Phone displays
“Obtaining IP
Address” for
more than
2 minutes
The DHCP server is not responding.
1. Check if the DHCP server is online or reboot the
router/device.
2. Check your VLAN settings if enabled. To exit the
DHCP searching mode, press the button 3
times. The phone will complete the boot and
return to idle.
LEDs flash red
and yellow on
keys associated
to SIP accounts
(keys 1 and 2)
1. Ensure the MAC address in the phone system
configuration is correctly entered then save and
reboot the phone.
2. Ensure the phone type (FON-450i/FON-550i) is
the same as the model you have.
3. Ensure the TFTP IP address is correct. To verify,
see “Updating the Firmware” on page 13.
4. Check network connections and firewall settings
at the phone system location if using as an
external extension.
No dial tone
when off-hook
1. Ensure the RJ-45 LAN cable is connected
correctly.
2. Ensure the phone is registered with a phone
system. See the previous topic for more
information.
No audio during
a call
1. Check the handset/headset connections
2. Make sure the phone is properly registered with
the phone system.
3. Check network connections and firewall settings
at the phone system location if using as an
external extension.
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