Guides on monitoring real-time voice and video
Written from primary sources: RFCs, ITU-T recommendations and vendor documentation. Every number links to where it comes from.
Voice agent latency: how to measure it end to end
Voice AI latency budget stage by stage, the numbers vendors publish in their docs, and how a synthetic canary measures time to first audio.
Synthetic monitoring for voice and video: why a 200 OK is not a working call
Definition, synthetic vs RUM vs uptime ping, and the four media failures an HTTP check cannot see, with a coverage table.
TURN server monitoring: what to check on coturn and managed TURN
Allocation, relay round-trip, cert expiry and quota checks for coturn and managed TURN, coturn Prometheus metrics, relay-only test.
VoIP monitoring: what to measure at each layer, and which tool catches which fault
RTCP/RTCP XR metrics, four monitoring layers, four tool classes, and a symptom-to-cause-to-metric table for SIP trunks and PBXs.
MOS score (Mean Opinion Score): the 1 to 5 call-quality scale explained
MOS scale, MOS-LQS/LQO/LQE, the 4.4 ceiling, E-model R-factor to MOS, R/MOS thresholds, and what vendors mean by "MOS".
WebRTC testing: what breaks at each layer and how to test it
Six layers of a WebRTC call, what fails in each, and which class of tool (browser automation, netem, load, RUM, canaries) covers it.