350-801 Question #71: Real Exam Question with Answer & Explanation

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 engineer configure to manage the codec negotiation?

Options

• ACFB
• Btranscoder
• CMTP
• DMOH

Explanation

To resolve a codec mismatch between an incoming G.711 call and a phone that only accepts G.729, a transcoder media resource must be configured on Cisco Unified Communications Manager or Cisco Unified Border Element to convert the audio stream between the two codecs.

Common mistakes.

• A. A Conference Bridge (CFB) allows multiple parties to join a conference call but does not primarily handle codec conversion for point-to-point calls.
• C. A Media Termination Point (MTP) is used to provide an IP address and port for media streams and sometimes to perform DTMF interworking or to break call flows into two distinct call legs, but it does not inherently perform codec transcoding.
• D. Music On Hold (MOH) provides audio to callers waiting in a queue or on hold and is unrelated to codec negotiation for active calls.

Concept tested. Codec mismatch resolution with transcoder

Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_0/systemConfig/cucm_b_system-configuration-guide-120/cucm_b_system-configuration-guide-120_chapter_01010.html

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