350-801 · Question #230
Refer to the exhibit. Which codec should an engineer select for a call made between Dallas- REG & Austin-REG?
The correct answer is B. G.729. For calls between Dallas-REG and Austin-REG, G.729 should be selected as the codec, indicating a scenario where bandwidth conservation is prioritized over maximum audio quality, likely across a Wide Area Network (WAN) link.
Question
Refer to the exhibit. Which codec should an engineer select for a call made between Dallas- REG & Austin-REG?
Exhibit
Options
- AMP4A-LATM
- BG.729
- COPUS
- DG.711
How the community answered
(24 responses)- A4% (1)
- B79% (19)
- C13% (3)
- D4% (1)
Why each option
For calls between Dallas-REG and Austin-REG, G.729 should be selected as the codec, indicating a scenario where bandwidth conservation is prioritized over maximum audio quality, likely across a Wide Area Network (WAN) link.
MP4A-LATM is a MPEG-4 audio codec primarily used for streaming audio, not a standard choice for real-time voice calls between Cisco UCM regions.
G.729 is a low-bandwidth codec (8 kbps) commonly chosen for voice calls traversing bandwidth-constrained WAN links between different geographical regions like Dallas and Austin. It effectively conserves network resources while providing acceptable voice quality for inter-region communication.
OPUS is a versatile audio codec used widely in internet applications like WebRTC but is not a primary or standard codec selected for inter-region voice calls within a traditional Cisco UCM deployment.
G.711 is a high-bandwidth codec (64 kbps) that offers the best voice quality but consumes significantly more bandwidth, making it less suitable for calls over bandwidth-limited WAN links between distinct regions.
Concept tested: Codec selection for inter-region calls
Source: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/12x/cucm_srnd12x/vgw.html
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