The problem may be something more exotic, but did you check to make sure that the lens cover isn't closed? Look at the camera mounted on top of the 9971. Do you see a white circle where the lens is? If so, the cover is closed. Gently turn the bevel to the left to open it.
If that isn't it, then check the camera while in preview mode. Is there a green light on the top?
I'll also assume that you have checked to make sure all of the phone firmware is up to date.
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
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
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...