The debug ccsip message are filtered and the noticeable diff is what you pointed out , for 9971 it shows no codec. What is the region setting between 9971 and the SIP trunk , also between 6941 and the SIP trunk. Can you share the running config and complete 'debug ccsip messages' for the test calls, as the details provided are incomplete to suggest anything. Have you tried making an out bound call through 9971 after disabling video capabilities on the phone?
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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 ...