Cisco 7931G Administration Guide - Page 209
Verifying IP Addressing and Routing, Verifying DNS Settings, IP Address, Subnet Mask
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Chapter 9 Troubleshooting and Maintenance Resolving Startup Problems Verifying IP Addressing and Routing You should verify the IP addressing and routing settings on the 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. To verify these settings, look at the following options on the Settings > Network Configuration menu on the phone. (For information about displaying this menu, see the "Displaying a Configuration Menu" section on page 4-3." • 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 "Network Configuration Menu" section on page 4-7 for instructions. 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 Verifying DNS Settings If you are using DNS to refer to the TFTP server or to Cisco Unified Communications Manager, you must ensure that you have specified a DNS server. Verify this setting by looking at the DNS Server 1 option on the Settings > Network Configuration menu on the phone. (For information about displaying this menu, see the "Displaying a Configuration Menu" section on page 4-3.") You should also verify that there is a CNAME entry in the DNS server for the TFTP server and for the Cisco Unified Communications Manager system. You must also ensure that DNS is configured to do reverse look-ups. Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 6.0 OL-12457-01 9-5