This might need a factory reset if the phone is stuck on Cisco logo. Please try the following steps if not tried already:
Step 1 While powering up the phone, press and hold #.
Step 2 When the light on the mute button and handset light strip turns off and all other lights (line button, headset button, speakerphone button and select button) stay green, press 123456789*0# in sequence.
When you press 1, the lights on the line buttons turn red. The light on the select button flash when a button is pressed.
If you press the buttons out of sequence, the lights on the line button, headset button, speakerphone button, and select button turn green. You will need to start over and press 123456789*0# in sequence again.
After you press these buttons, the phone goes through the factory reset process.
Do not power down the phone until it completes the factory reset process, and the main screen appears.
I've done it (factory reset) successfully. But this problem is occurring often. I would like to know the actual reason as well as solution (with out factory reset) regarding this problem to minimize the disturbing service of our customer.
The line is configured to the phone. I clarify you that phone is working properly but sometime the problem occurred and it stuck after powered up. Then it becomes good after factory reset. It looks odd if this phone comes back with this problem from our customer.
So I need the exact solution and as well as to know the reasons for this problem to avoid this problem.
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
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