the command "no ip address trusted authenticate" made the difference, after setting the command, the INVITE was forwarded to CUCM (which was the root issue in my case).
Now the INVITE message was send to CUCM, but as response I received a 401 unauthorized and then a 503 Service Unavailable, as the CUBE is not sending any digest authentication to the CUCM.
To solve this issue I added the command "authentication username xxx password yyy realm zzz" under sip-ua and then the 401 unauthorized of CUCM get´s answered with a INVITE with digest authentication..CUCM accept´s the INVITE and call is getting established !
So just to summarize I attached the configuration of the CUBE and the ccsip message trace...
Many thanks to all !!!
117891-solved - sh run - REGISTER PASSTHROUGH to CUCM.txt.zip
The short answer is that you don't.... That isn't entirely true while at
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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 ...
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