Error 4 is an Authentication Error. Basically, you cannot push content to the IP Phone unless you are authorized to access that phone. This works as designed since we don't want someone just being able to push unsolicited content to any IP phone. Authentication is configured through User Preferences/Associated Devices. If you need some kind of broadcast push mechanism, then you may want to create a PhoneSvcsAdmin user account and associate all phone devices to that account.
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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 ...