Verifying ip addressing and routing, Verifying dns settings – Cisco 7912G User Manual
Page 109
7-5
Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.0 (SIP), Cisco Unified IP Phones
OL-8131-01
Chapter 7 Troubleshooting the Cisco Unified IP Phone
Resolving Startup Problems
Verifying IP Addressing and Routing
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:
•
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
.
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:
For information about determining and changing IP addressing and routing
settings, see
Chapter 4, “Configuring Settings on the Cisco Unified IP Phone,”
or
Appendix A, “Reference List of Parameters.”
Verifying DNS Settings
If you are using a fully qualified domain name (FQDN) 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.
For information about determining and changing DNS settings, see