350-801 · Question #71
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…
The correct answer is B. transcoder. 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.
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
How the community answered
(56 responses)- A14% (8)
- B75% (42)
- C7% (4)
- D4% (2)
Why each option
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.
A Conference Bridge (CFB) allows multiple parties to join a conference call but does not primarily handle codec conversion for point-to-point calls.
A transcoder media resource is specifically designed to convert audio streams from one codec to another (e.g., G.711 to G.729) in real-time. When a device like a phone only supports a specific codec that differs from the incoming call's codec, a transcoder is necessary to enable communication.
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.
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
Source: 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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