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TROUBLESHOOTING
Symptom
Nothing showing on the LCD
No dial tone when off-hook
LEDs flash red and yellow
on keys associated to SIP
accounts (keys 1 and 2)
Phone displays "Obtaining
IP Address" for more than
2 minutes
No audio during a call
F O R T I F O N E - 4 5 0 i A N D F O R T I F O N E - 5 5 0 i T E L E P H O N E S T A R T G U I D E
Corrective Action
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.
1. Ensure the RJ-45 LAN cable is connected correctly.
2. Ensure the phone is registered with a phone system.
See the next topic for more information.
The account associated to this key is not registered with the
phone system or ITSP.
1. Ensure the MAC address in the phone system configuration is
correctly entered then save and reboot the phone.
2. Ensure the phone type (FortiFone-450i/FortiFone-550i) is
the same as the model you have.
3. Ensure the TFTP IP address is correct. To verify, see the
Firmware Update section.
4. Check network connections and firewall settings at the phone
system location if using as an external extension.
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
The phone will complete the boot and return to idle.
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.
button 3 times.
2 7
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