Verifying Ip Addressing And Routing; Verifying Dns Settings - Cisco 7960 Administration Manual

Chapter 7 Troubleshooting the Cisco IP Phone

Verifying IP Addressing and Routing

Verifying DNS Settings

Cisco IP Phone Administration Guide for Cisco CallManager 3.2, Cisco IP Phones 7960/7940/7910
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You must unlock the network settings before you can assign an alternate TFTP
server (see "Accessing the Network Configuration Settings" section on page
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. See
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. Refer to the
If you are using DHCP, check the IP addresses distributed by your DHCP server.
See Understanding and Troubleshooting DHCP in Catalyst Switch or Enterprise
Networks on Cisco.com:
If you are using DNS to refer to the TFTP server or Cisco CallManager, you must
ensure you have specified a DNS server (settings > Network Configuration >
DNS Server 1). You should also verify that you have a CNAME entry in the DNS
server for the TFTP server and Cisco CallManager system.
You must also ensure that DNS is configured to do reverse look-ups. The default
setting on Windows2000 is to perform forward-only look-ups.
"Configuring IP Settings" section on page
http://www.cisco.com/warp/customer/473/100.html#41
Resolving Startup Problems
5-2).
5-14.
7-19