210-065 · Question #256
Refer to the exhibit. Users in a Cisco TelePresence room report audio and video quality issues. You have been asked to troubleshoot the issue. You log in to the endpoint GUI and check telephony…
The correct answer is F. The "DSCP For TelePresence" and "DSCP For Audio" values are not correct. Audio and video quality issues in Cisco TelePresence are commonly caused by incorrect DSCP QoS markings, which prevent proper traffic prioritization across the network.
Question
Refer to the exhibit. Users in a Cisco TelePresence room report audio and video quality issues. You have been asked to troubleshoot the issue. You log in to the endpoint GUI and check telephony settings. Which option would you recommend to resolve the issue?
Exhibit
Options
- AAudio/video quality issues are generally due to low bandwidth.
- B"DSCP For TelePresence" is not correct.
- C"DSCP For Audio" is not correct.
- DDSCP values are correct.
- EThe "DSCP For TelePresence" and "DSCP For Audio" values are not correct.
- FThe "DSCP For TelePresence" and "DSCP For Audio" values are not correct.
How the community answered
(40 responses)- A15% (6)
- B3% (1)
- C8% (3)
- D28% (11)
- F48% (19)
Why each option
Audio and video quality issues in Cisco TelePresence are commonly caused by incorrect DSCP QoS markings, which prevent proper traffic prioritization across the network.
While low bandwidth can cause quality issues, the question directs troubleshooting to telephony settings, making a DSCP misconfiguration the more actionable and specific finding.
This option states only the TelePresence video DSCP value is wrong while implying audio is correct, which is an incomplete diagnosis if both values are misconfigured.
This option states only the audio DSCP value is wrong while implying the TelePresence video value is correct, which is also an incomplete diagnosis.
If DSCP values were correct, the endpoint would properly prioritize media traffic and the quality issues described would not be caused by QoS misconfiguration.
Cisco TelePresence endpoints should mark video traffic with DSCP AF41 (decimal 34) and audio traffic with DSCP EF (decimal 46); if both values are misconfigured in the telephony settings, the network cannot prioritize either media stream, causing both audio and video quality degradation.
Concept tested: DSCP QoS markings for TelePresence audio and video
Source: https://www.cisco.com/c/en/us/td/docs/telepresence/infrastructure/vcs/config_guide/Cisco-VCS-Configuration-and-Administration-Guide.html
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