Cisco 7912G Administration Guide - Page 127
Symptom: Cisco IP Phone Not Registering with CiscoCallManager
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Chapter 6 Troubleshooting the Cisco IP Phone Resolving Startup Problems To determine whether the phone is functional, you must eliminate any other potential problems, such as faulty cables, network outages, lack of power, and so on. Follow these suggestions to systematically eliminate these other causes. Procedure Step 1 Step 2 Step 3 To verify that the network port is functional: a. Exchange the Ethernet cables with cables you know are functional. b. Disconnect a functioning Cisco IP Phone from another port and connect it to this network port to verify the port is active. c. Connect the Cisco IP Phone that will not start up to a different network port that you know to be good. d. Connect the Cisco IP Phone that will not start up directly to the port on the switch, eliminating the patch panel connection in the office. To verify that the phone is receiving power: a. Verify that the electrical outlet is functional. b. If you are using in-line power, use the external power supply instead. c. If you are using the external power supply, switch with a unit you know to be functional. Cisco IP Phone models 7905G/7912G only. If, after attempting these solutions, the LCD screen persists in not displaying any characters for at least five minutes, contact a Cisco technical support representative for additional assistance. Symptom: Cisco IP Phone Not Registering with Cisco CallManager If a phone proceeds past the first stage (LED buttons flashing on and off), and, on a Cisco IP Phone model 7905G/7912G, continues to cycle through the messages displaying on the LCD screen, then 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 CallManager server. Cisco IP Phone Administration Guide for Cisco CallManager 3.3, Cisco IP Phones 7902G/7905G/7912G OL-6313-01 6-13