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Cisco IP Phone Administration Guide for Cisco CallManager 3.3, Cisco IP Phones 7902G/7905G/7912G
OL-6313-01
Chapter 6 Troubleshooting the Cisco IP Phone
Resolving Startup Problems
Verifying TFTP Server Settings
The Cisco IP Phone uses the TFTP server setting (Settings > Network
Configuration > TFTP Server 1) to identify the Cisco CallManager server. If
this setting is incorrect, the Cisco IP Phone might continually cycle while
attempting to contact the identified TFTP Server.
If you have assigned a static IP address to the phone, you must manually enter this
setting. See the “Configuring IP Settings” section on page 4-15.
If you are using DHCP, the phone obtains the address for the TFTP server from
the DHCP server. Check the IP address configured in Option 150. Refer to
Configuring Windows 2000 DHCP Server for Cisco Call Manager on Cisco.com:
http://www.cisco.com/warp/customer/788/AVVID/win2000_dhcp.html
You can also enable the phone to use an alternate TFTP server (Settings >
Network Configuration > Alternate TFTP Server). This is particularly useful
if this phone was recently moved from a different location, such as a test lab to a
production network.
You must unlock the network settings before you can assign an alternate TFTP
server (see “Accessing Network Configuration Settings from a Cisco IP Phone”
section on page 4-2).
Verifying IP Addressing and Routing
You should verify the IP addressing and routing settings on the IP Phone. If you
are using DHCP, the DHCP server should provide these values. If you have
assigned a static IP address to the phone, you must enter these values manually.
On the Cisco IP Phone, press Settings > Network Configuration and check for
the following problems:
• DHCP Server—has no address
If you have assigned a static IP address to the phone, you do not need to enter
a value here. However, if you are using a DHCP server, this field must have a
value. If it does not, check your IP routing and VLAN configuration. Refer to
Troubleshooting Switch Port Problems on Cisco.com:
http://www.cisco.com/warp/customer/473/53.shtml
• IP address, subnet mask, or default router—have no addresses
If you have assigned a static IP address to the phone, you must manually enter
these settings. See the “Configuring IP Settings” section on page 4-15.