Troubleshooting guide

Troubleshooting Guide
72
TFTP load failure DHCP option 43 or 125 on 3300
Release 7.0 or later systems or
option 128 for earlier releases is
not set up to point to the right
TFTP server (Controller).
Check the DHCP server, and confirm that
option 43, 125, or 128 is pointing to the right
TFTP server.
No network connectivity between
the controller and the phone.
1. Confirm that the controller is connected to
the network.
2. For a Cisco L2 switch: verify that the L2
switch is access port (Voice LAN).
3. For an HP L2 switch: verify that the L2 switch
is untagged (Voice LAN).
4. If the router is involved, make sure that the
router's MTU is set to 600 or more.
Firmware on controller is missing
or corrupted.
1. Verify that the firmware
(ipp510bootenc.bin, etc.) is in the
sysro/tftp directory (particularly if the user
has manually copied the firmware).
2. Confirm if TFTP on the controller is
corrupted (this can be verified by connecting
the IP Phone directly on the controller, or by
observing the behavior of other IP Phones).
Tip: If you have Option 132/133
programmed on the controller’s internal
DHCP server, disable them before trying
Step 2.
Your installation is using the
controller’s internal DHCP
server, but DBMS Save is not on.
Enter the DBMS Save command through the
Maintenance Commands form.
Waiting for link DHCP option 43 or 125 on 3300
Release 7.0 or later systems or
option 129 for earlier Releases is
not programmed correctly.
Check Option 43, 125, or 129 on DHCP to
confirm that the IP address is programmed
correctly. (RTC IP Address of controller; for the
MXe Server, use the controller System IP
address.)
Spanning Tree protocol is
disabled. It’s used to provide
location and location information
for Emergency Services (E911).
Ensure Spanning Tree protocol is enabled.
The application server is
broadcasting or multicasting on
IP Phone port or on PC behind
the IP Phone.
Turn off multicasting.
The PC behind the IP Phone is
changing speed 100/10.
Depending on the NIC, you may need to
hardcode to 100 MBps instead of auto
negotiation.
Table 18: IP Phone Registration Troubleshooting
Error Message on
Display
Possible Cause Corrective Action
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