Media Resource Configuration for Codec Negotiation
Question
An incoming off-net call to a user fails.
An engineer notices that the off-net call is G.711, but the phone accepts only G.729
Which media resource on a Cisco Unified Border Element and Cisco Unified Communications Manager must the engineer configure to manage the codec negotiation?
Answers
Explanations
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A. B. C. D.A.
When an incoming off-net call fails, it means that the call from outside the network is unable to establish a successful call with the user within the network. One of the possible reasons for the failure is a mismatch in the codecs used by the calling and called parties. In this case, the off-net call is using G.711, which is not supported by the phone, which accepts only G.729.
To resolve this issue, a media resource needs to be configured on both Cisco Unified Border Element (CUBE) and Cisco Unified Communications Manager (CUCM) to manage the codec negotiation. The media resource that is responsible for transcoding is the Transcoder.
A transcoder is a hardware or software resource that can convert a media stream from one codec to another. In this case, the transcoder can convert the incoming G.711 call to G.729 to match the phone's codec.
Therefore, the correct answer to this question is A. Transcoder. By configuring a transcoder on both CUBE and CUCM, the call can be established successfully.
