350-801 Question #230: Real Exam Question with Answer & Explanation

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.

Media and QoS

Question

Refer to the exhibit. Which codec should an engineer select for a call made between `Dallas- REG` & `Austin-REG`?

Options

AMP4A-LATM
BG.729
COPUS
DG.711

Explanation

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.

Common mistakes.

A. 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.
C. 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.
D. 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

Reference. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/12x/cucm_srnd12x/vgw.html

Topics

#Codecs#Bandwidth Management#WAN Optimization#Voice Quality

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