Cisco 7931G Administration Guide - Page 207

Chapter 9 Troubleshooting and Maintenance Resolving Startup Problems - If you are using external power, verify that the electrical outlet is functional. - If you are using in-line power, use the external power supply instead. - Switch the external power supply with a unit that you know to be functional. - If you are using a in-line power, make sure that the phone is connected to a switch that supports IEEE 802.3af Class 3. For more information, see the "Providing Power to the Phone" section on page 2-4. 3. If the phone still does not start up properly, power up the phone with the handset off-hook. When the phone is powered up in this way, it attempts to launch a backup software image. 4. If the phone still does not start up properly, perform a factory reset of the phone. For instructions, see the "Performing a Factory Reset" section on page 9-20. If after attempting these solutions, the screen on the Cisco Unified IP Phone does not display any characters after at least five minutes, contact a Cisco technical support representative for additional assistance. Symptom: The Cisco Unified IP Phone Does Not Register with Cisco Unified Communications Manager If the phone proceeds past the first stage of the startup process (LED buttons flashing on and off) but continues to cycle through the messages displaying on the phone screen, the phone is not starting up properly. The phone cannot successfully start up unless it is connected to the Ethernet network and it has registered with a Cisco Unified Communications Manager server. These sections can assist you in determining the reason the phone is unable to start up properly: • Identifying Error Messages, page 9-4 • Checking Network Connectivity, page 9-4 • Verifying TFTP Server Settings, page 9-4 • Verifying IP Addressing and Routing, page 9-5 • Verifying DNS Settings, page 9-5 Cisco Unified IP Phone 7931G Administration Guide for Cisco Unified Communications Manager 6.0 OL-12457-01 9-3