Source note · Call quality metrics and MOS estimation
In the RTCP XR VoIP Metrics block the R factor is an integer from 0 to 100, where 94 corresponds to toll quality, 50 or less is regarded as unusable, and 127 means unavailable.
Checked 2026-09-24
It is expressed as an integer in the range 0 to 100, with a value of 94 corresponding to 'toll quality' and values of 50 or less regarded as unusable.
- Vendor
- IETF
- Product
- RTCP XR
- Subsystem
- VoIP Metrics Report Block
- Deployment
- any
- Region
- not restricted
- Release range
- RFC 3611
- Checked
- 2026-09-24
Sources
- RTP Control Protocol Extended Reports (RTCP XR) — IETF / RFC Editor · tier 1 standards and regulators · Section 4.7.5, R factor
Cite this note
APA
WarmTransfer. (2026, September 24). Call quality metrics and MOS estimation: source note call-quality-metrics-rtcpxr-r-factor. WarmTransfer. https://warmtransfer.net/knowledge/claims/call-quality-metrics-rtcpxr-r-factor
BibTeX
@misc{warmtransfer-claim-call-quality-metrics-rtcpxr-r-factor,
title = {Call quality metrics and MOS estimation: source note call-quality-metrics-rtcpxr-r-factor},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/call-quality-metrics-rtcpxr-r-factor},
note = {Source note call-quality-metrics-rtcpxr-r-factor, checked 2026-09-24}
}