Cisco 7961G Administration Guide - Page 220
General Troubleshooting Tips
UPC - 746320949147
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General Troubleshooting Tips Chapter 9 Troubleshooting and Maintenance Table 9-1 Cisco Unified IP Phone Security Troubleshooting (continued) Problem Possible Cause Factory Reset Deleted 802.1X Shared Secret Phone cannot obtain a DHCP-assigned IP address Phone does not register with Cisco Unified CallManager 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 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 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. 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 Explanation Daisy-chaining IP phones. Do not connect an IP phone to another IP phone through the access port. Each IP phone should directly connect to a switch port. If you connect IP phones together in a line (daisy-chaining), a problem with one phone can affect all subsequent phones in the line. Also, all phones on the line share bandwidth. Poor quality when calling digital cell phones using the G.729 protocol. In Cisco Unified CallManager, 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. 9-14 Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE Administration Guide for Cisco Unified CallManager OL-11528-01