Cisco 7965G Administration Guide - Page 168

General Troubleshooting Tips Chapter 9 Troubleshooting and Maintenance Table 9-1 Cisco Unified IP Phone Security Troubleshooting (continued) Problem Possible Cause 802.1X Not Enabled Phone cannot obtain a DHCP-assigned IP address Phone does not register with Cisco Unified Communications Manager These errors typically indicate that 802.1X authentication is not enabled on the phone. To enable it, see the "802.1X Authentication and Status" section on page 4-34. Phone status display as "Configuring IP" or "Registering" 802.1X Authentication Status displays as "Disabled" Status menu displays DHCP status as timing out Factory Reset Deleted 802.1X Shared Secret Phone cannot obtain a DHCP-assigned IP address Phone does not register with Cisco Unified Communications Manager Phone status display as "Configuring IP" or "Registering" Cannot access phone menus to verify 802.1X status These errors typically indicate that the phone has completed a factory reset (see the "Performing a Factory Reset" section on page 9-15) while 802.1X was enabled. A factory reset deletes the shared secret, which is required for 802.1X authentication and network access. To resolve this, you have two options: • Temporarily disable 802.1X authentication on the switch. • Temporarily move the phone to a network environment that is not using 802.1X authentication. Once the phone starts up normally in one of these conditions, you can access the 802.1X configuration menus and re-enter the shared secret (see the "802.1X Authentication and Status" section on page 4-34). General Troubleshooting Tips Table 9-2 provides general troubleshooting information for the Cisco Unified IP Phone. Table 9-2 Cisco Unified IP Phone Troubleshooting Summary Daisy-chaining IP phones Poor quality when calling digital cell phones using the G.729 protocol Explanation Daisy chaining (connecting an IP phone to another IP phone through the access port) is not supported. Each IP phone should directly connect to a switch port. In Cisco Unified Communications Manager, you can configure the network to use the G.729 protocol (the default is G.711). When using G.729, calls between an IP phone and a digital cellular phone will have poor voice quality. Use G.729 only when absolutely necessary. 9-10 Cisco Unified IP Phone 7965G and 7945G Administration Guide for Cisco Unified Communications Manager 6.1 OL-14641-01