Verifying Ip Addressing And Routing; Verifying Dns Settings - Cisco 7902G Administration Manual

Chapter 7 Troubleshooting the Cisco Unified IP Phone

Verifying IP Addressing and Routing

Verifying DNS Settings

Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.0 (SCCP), Cisco Unified IP Phones
OL-8151-01
You should verify the IP addressing and routing settings for the
Cisco Unified 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.
Check for the following problems:
DHCP Server—If you have assigned a static IP address to the phone, you do
•
not need to enter a value for the DHCP Server option. However, if you are
using a DHCP server, this option must have a value. If it does not, check your
IP routing and VLAN configuration. Refer to Troubleshooting Switch Port
Problems, available at this URL:
http://www.cisco.com/warp/customer/473/53.shtml
IP Address, Subnet Mask, Default Router—If you have assigned a static IP
•
address to the phone, you must manually enter settings for these options. See
the "Configuring IP Settings" section on page
If you are using DHCP, check the IP addresses distributed by your DHCP server.
Refer to Understanding and Troubleshooting DHCP in Catalyst Switch or
Enterprise Networks, available at this URL:
http://www.cisco.com/warp/customer/473/100.html#41
For information about determining and changing IP addressing and routing
settings, see Chapter 4, "Configuring Network Settings on the
Cisco Unified IP Phone,"
and Parameters."
If you are using DNS to refer to the TFTP server or to Cisco Unified CallManager,
you must ensure that you have specified a DNS server. You should also verify that
there is a CNAME entry in the DNS server for the TFTP server and for the
Cisco Unified CallManager system.
You must also ensure that DNS is configured to do reverse look-ups.
For information about determining and changing DNS settings, see
"Configuring Network Settings on the Cisco Unified IP Phone,"
"Additional Configuration Methods and Parameters."
or Appendix A, "Additional Configuration Methods
Resolving Startup Problems
4-20.
Chapter 4,
or Appendix A,
7-5