Seeing DSCP 0 at the far end of a call that crossed the public Internet or another provider's domain does not by itself show the near-end endpoint failed to mark; markings must be checked hop by hop starting at the sender's access port.
inferred · Checked 2026-10-02
- Vendor
- not restricted
- Product
- not restricted
- Subsystem
- Hop-by-hop verification
- Deployment
- any
- Region
- not restricted
- Release range
- current as of 2026-10-02
- Status
- inferred
- Checked
- 2026-10-02
Sources
- RFC 2474: Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers — IETF / RFC Editor · tier 1 standards and regulators · Section 3 combined with RFC 2475 Section 2.1.2 and Microsoft Teams QoS Step 5
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting voice QoS markings that are stripped or ignored: source note voice-qos-troubleshooting-far-end-ef-not-proof. WarmTransfer. https://warmtransfer.net/knowledge/claims/voice-qos-troubleshooting-far-end-ef-not-proof
BibTeX
@misc{warmtransfer-claim-voice-qos-troubleshooting-far-end-ef-not-proof,
title = {Troubleshooting voice QoS markings that are stripped or ignored: source note voice-qos-troubleshooting-far-end-ef-not-proof},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/voice-qos-troubleshooting-far-end-ef-not-proof},
note = {Source note voice-qos-troubleshooting-far-end-ef-not-proof, checked 2026-10-02}
}