An engineer is configuring a Cisco Unified Border Element to allow the video endpoints to negotiate without the Cisco Unified Border Element interfering in the process. What should the engineer configure on the Cisco Unified Border Element to support this process?
A. Configure codec transparent on the dial peers.
B. Configure a transcoder for video protocols.
C. Configure a hardcoded codec on the dial peers.
D. Configure pass-thru content sdp on the voice service.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/cube-codec-basic.html
If codec filtering is not required, CUBE also supports transparent codec negotiations. This enables negotiations between endpoints with CUBE leaving the codec information untouched.
A is the correct answer
D: Configure pass-thru content sdp on the voice service.
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/cube-codec-basic.html
You can use ‘pass-thru content sdp’, if you do not want to involve CUBE in the codec negotiation.