1) Change out the phone to another one and program the new phone with the old phones DN. See if problem persists.
2) Put problem phone on a known-good port on the switch and see if the problem follows the phone.
If it is the port then patch the drop into a different port on the switch and make any needed changed on the switch (VLAN, etc)
3) You can also put a power supply on the phone (if you have one) since you are using POE and see if it still reboots. If it no longer reboots but just looses connectivity then this points to the switch as the culprit.
These steps should get you some quick and dirty answers.
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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 ...