Cisco 7941G Administration Guide - Page 237

Chapter 9 Troubleshooting and Maintenance Cisco Unified IP Phone Resets Unexpectedly • Identifying Intermittent Network Outages, page 9-9 • Verifying DHCP Settings, page 9-9 • Checking Static IP Address Settings, page 9-10 • Verifying the Voice VLAN Configuration, page 9-10 • Verifying that the Phones Have Not Been Intentionally Reset, page 9-10 • Eliminating DNS or Other Connectivity Errors, page 9-11 Verifying the Physical Connection Verify that the Ethernet connection to which the Cisco Unified IP Phone is connected is up. For example, check whether the particular port or switch to which the phone is connected is down and that the switch is not rebooting. Also make sure that there are no cable breaks. Identifying Intermittent Network Outages Intermittent network outages affect data and voice traffic differently. Your network might have been experiencing intermittent outages without detection. If so, data traffic can resend lost packets and verify that packets are received and transmitted. However, voice traffic cannot recapture lost packets. Rather than retransmitting a lost network connection, the phone resets and attempts to reconnect its network connection. If you are experiencing problems with the voice network, you should investigate whether an existing problem is simply being exposed. 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 Phone 7961G/7961G-GE and 7941G/7941G-GE for Cisco Unified Communications Manager 6.1 OL-14620-01 9-9