D 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."

Selected Answer: D D A is probably referring to voice-class codec transparent being applied to the dial-peers, but this is only for the initial offer and the response can still be changed by the CUBE with that method. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/cube-codec-basic.html#id_128259

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. You can use 'pass-thru content sdp', if you do not want to involve CUBE in the codec negotiation.

Selected Answer: D Correct answer D. You can use 'pass-thru content sdp', if you do not want to include CUBE in the codec negotiation. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/cube-codec-basic.html#id_128259

I think A may be the correct answer. The question is about a specific requirement, ie video, not all voice/video services that are running through the CUBE. The voice-class codec transparent would be applied to a dial-peer for say a specific video requirement. The 'pass-thru content sdp' would be applied to the voice service affecting ALL traffic (voice and video)

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/cube-codec-basic.html

About codec transparent, keep in mind this: Only codecs that are supported by the IPIPGW or CUBE are transparently passed. If an unsupported codec is requested, call setup will fail.

So, if you are supporting only cisco video endpoint, you probably only need codec transparent. But if you are supporting cisco video endpoint with third-party enpoints which might support different attributes or capabilities unsupported by CUBE, you probably will need pass-thru content sdp that will pass SDP untouched between different third-party endpoints. The problem is that the question do not say if the endpoints are just cisco, or different third-party.

Tricky bc it says Voice service instead of voice codec

Note You can use 'pass-thru content sdp', if you do not want to include CUBE in the codec negotiation.

on the link given by the exam: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/cube-codec-basic.html Confirms ANSWER D