Cisco UCM QoS Settings and Configuration
Short answer
AD Have the option to set the DSCP values for "video calls", "audio portion of the video calls", and "immediate video calls" separately. Configure the clusterwide QoS parameters in the Cisco CallManager Service Parameter section on any nodes within the Cisco UCM cluster.
Question
Key Takeaways
The exam tests the distinction between audio/video DSCP values and the correct location for cluster-wide QoS configuration, often trapping candidates who confuse Service Parameters with Enterprise Parameters or assume default static tagging without verification.
This question tests knowledge of Quality of Service (QoS) configuration in Cisco Unified Communications Manager, specifically regarding DSCP tagging for media streams. The community consensus confirms that administrators can set distinct DSCP values for different video call types and configure these settings via Clusterwide Service Parameters.
Common mistake: Candidates often select Option B because they recall that voice is typically marked AF41 (DSCP 34) or EF (DSCP 46), but incorrectly assume video audio portions share the same high-priority marking as pure voice, or they miss the nuance in Option A regarding separate video call types.
Expert Analysis
Why the Answer Is Correct
Option A is correct because CUCM allows granular control over DSCP markings for 'video calls', 'audio portion of video calls', and 'immediate video calls' separately within the Service Parameters. Option D is correct because QoS parameters are indeed configured under the Cisco CallManager Service Parameters section, which applies cluster-wide.
Why the Other Options Are Wrong
Option B is incorrect because while voice is typically marked EF (46), the audio portion of video calls is often marked differently (commonly AF41/34) to distinguish it from pure voice; assuming they are both 46 is a simplification error. Option C is incorrect because CUCM does not force all video types to the same value if granular settings are enabled; it supports differentiation. Note: Some comments refer to an Option E which likely corresponds to the text in D or a missing option in the provided list, but based on standard CUCM behavior, the Service Parameter location is key.
Community Comment Notes
Comment [2] provides critical clarification that Option B is not advisable due to DiffServ standards distinguishing video audio from voice. Comments [1] and [3] highlight a discrepancy in the question's labeling, noting that the correct configuration option might be mislabeled as 'D' instead of 'E' in some versions, but agree that the Service Parameters location is the deciding factor for the second correct choice.
Exam Strategy
Always verify where parameters are configured (Service vs. Enterprise Parameters). For QoS questions, remember that voice is usually EF (46) and video/audio is often AF41 (34), unless specific granular overrides are mentioned.
Community Votes
75% of anonymous learners picked answer AD. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 3 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 3
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sneff91 👍 2I don't know why it has two options for B... A is correct and what is currently listed as D (which SHOULD be "E") is also correct.
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G0y0 👍 1 Answered AB. is not advisable, since video calls and it audio portion must be set up at the same DiffServ, 34. They can not be set to 46. C. is incorrect. Clusterwide QoS parameter does not exist in Enterprise Parameters. D. is incorrect. DSCP for video applies for CUCM desktop endpoints and softphones. A and E are correct. They exist in Service Parameters.
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c6176b5 👍 1It should be A and "E". You can configure clusterwide DSCP under Serviceparameters.
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