•
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. See Troubleshooting Switch Port Problems
at this URL: http://www.cisco.com/en/US/products/hw/switches/ps708/prod_tech_notes_list.html
•
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 Network Configuration Menu, on page 66 for
instructions.
Step 2
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 at this URL: http://www.cisco.com/en/
US/tech/tk648/tk361/technologies_tech_note09186a00800f0804.shtml
Verify DNS Settings
To verify DNS settings, perform these steps.
Procedure
Step 1
Verify this setting by pressing Settings.
Step 2
Choose Network Configuration and scroll to the DNS Server 1 option.
Step 3
Verify that a CNAME entry exists in the DNS server for the TFTP server and for the
Cisco Unified Communications Manager system.
Step 4
Ensure that DNS is configured to do reverse look-ups.
Create New Phone Configuration File
If you continue to have problems with a particular phone that other suggestions in this chapter do not resolve,
the configuration file may be corrupted.
Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and 7945G Administration Guide for Cisco Unified
Communications Manager 9.0 (SCCP and SIP)
229
Troubleshooting and Maintenance
Troubleshooting Procedures
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