Cisco CP-7911G Administration Guide - Page 230
Verifying DHCP Settings, Checking Static IP Address Settings, Verifying Voice VLAN Configuration
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Cisco Unified IP Phone Resets Unexpectedly Chapter 9 Troubleshooting and Maintenance Verifying DHCP Settings The following suggestions can help you determine if the phone has been properly configured to use DHCP: 1. Verify that you have properly configured the phone to use DHCP. See the "Network Configuration Menu" section on page 4-7 for more information. 2. Verify that the DHCP server has been set up properly. 3. Verify the DHCP lease duration. Cisco recommends that you set it to 8 days. Cisco Unified IP Phones send messages with request type 151 to renew their DHCP address leases. If the DHCP server expects messages with request type 150, the lease will be denied, forcing the phone to restart and request a new IP address from the DHCP server. Checking Static IP Address Settings If the phone has been assigned a static IP address, verify that you have entered the correct settings. See the "Network Configuration Menu" section on page 4-7 for more information. Verifying Voice VLAN Configuration If the Cisco Unified IP Phone appears to reset during heavy network usage (for example, following extensive web surfing on a computer connected to same switch as phone), it is likely that you do not have a voice VLAN configured. Isolating the phones on a separate auxiliary VLAN increases the quality of the voice traffic. 9-10 Cisco Unified IP Phone 7906G and 7911G for Cisco Unified Communications Manager 6.0 OL11954-01