350-801 Question #489: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. An administrator is attempting to resolve a DTMF issue to a specific IVR and has supplied logs from the most recent issue. What is the cause and solution of the issue?

Options

• AThe local endpoint supports RFC2833, and the IVR supports only KPML. Configure an MTP to
• BThe local endpoint does not support RFC2833, and the IVR supports only RFC2833. Configure a
• CThe local endpoint does not support RFC2833, and the IVR supports only RFC 2833. Configure
• DThe local endpoint supports RFC2833, and the IVR supports only KPML. Configure a transcoder

Explanation

The exhibit, which is not provided but implied, shows a DTMF mismatch where the local endpoint does not support RFC2833 while the IVR only supports RFC2833. The solution is to configure a Media Termination Point (MTP) to transcode or convert the DTMF signaling between the non-RFC2833 endpoint and the RFC2833-only IVR.

Common mistakes.

• A. This option incorrectly states that the local endpoint supports RFC2833 and the IVR supports only KPML; the provided correct answer indicates the opposite scenario (endpoint doesn't support RFC2833, IVR does).
• C. This option is a duplicate of B, but without the full solution provided, making it less complete.
• D. A transcoder is typically used for converting audio codecs (e.g., G.711 to G.729), not primarily for converting DTMF relay methods like RFC2833 to KPML; an MTP is the direct solution for handling DTMF relay mismatches.

Concept tested. DTMF Relay Interworking using MTP

Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab12/srnd/mtp_transcoder.html

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