Using QoS DSCP Marking

Publisher

Zoom (Zoom Support)

URL

https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0066617

Published

unknown

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Zoom terms (not verified); no-redistribution; short excerpts and locators only

Source notes citing this source

• Zoom's documented default audio marking of 56 is the CS7 codepoint, which RFC 4594 reserves and recommends dropping or re-marking at ingress. On a network that follows RFC 4594, Zoom audio left at the default is therefore likely to be re-marked or dropped rather than placed in an EF priority queue. inferred in context
• Zoom Support lists the default Zoom DSCP markings as 56 for audio, 40 for video and 40 for screen sharing. in context
• A network QoS policy that classifies voice only by DSCP EF (46) will not place Zoom audio at its default marking of 56 in the EF priority queue unless the policy also matches 56 or the Zoom values are changed to 46. inferred in context
• Zoom's default DSCP marking values are 56 for audio, 40 for video and 40 for screen sharing. in context
• On Windows, Zoom desktop and Zoom Rooms need administrative privileges to apply DSCP marking, or the organisation can deploy Group Policy QoS policies matching Zoom.exe or ZoomRooms.exe with Independent Data Ports enabled. in context

Cite this source record

APA

WarmTransfer. (2026, September 24). Using QoS DSCP Marking. WarmTransfer. https://warmtransfer.net/knowledge/sources/zoom-kb0066617-using-qos-dscp-marking

BibTeX

@misc{warmtransfer-zoom-kb0066617-using-qos-dscp-marking,
  title  = {Using QoS DSCP Marking},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/zoom-kb0066617-using-qos-dscp-marking},
  note   = {Zoom (Zoom Support), accessed 2026-09-24}
}