Cisco 7941G Administration Guide - Page 238

Cisco Unified IP Phone Resets Unexpectedly Chapter 9 Troubleshooting and Maintenance 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 the 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 the same switch as the 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. See the "Understanding How the Cisco Unified IP Phone Interacts with the VLAN" section on page 2-3 for details. Verifying that the Phones Have Not Been Intentionally Reset If you are not the only administrator with access to Cisco Unified Communications Manager, you should verify that no one else has intentionally reset the phones. You can check whether a Cisco Unified IP Phone received a command from Cisco Unified Communications Manager to reset by pressing the Settings button on the phone and choosing Status > Network Statistics. If the phone was recently reset one of these messages appears: • Reset-Reset-Phone closed due to receiving a Reset/Reset from Cisco Unified Communications Manager Administration. • Reset-Restart-Phone closed due to receiving a Reset/Restart from Cisco Unified Communications Manager Administration. 9-10 Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE for Cisco Unified Communications Manager 6.1 OL-14620-01