Make sure that whatever is handing out DHCP addresses (router or DHCP server) is passing out option 150. Option 150 tells the phone where to go for it's config. You can also configure a static TFTP server address on the phone.
Check the switchport negotiation. If the switch is hard set to something and the phone is set to auto, it could be trying to negotiated, then reboot, and keep doing this. Or you have a cable that is too long, or bad, etc. (patch)
I had this happen when I was working at an old site with CAT3. The phones would work when forced to 10F, but not in Auto and would always reboot.
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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 ...