Find the first failed stage
Start with a single affected call and a timestamp. Check microphone capture, application signaling, session negotiation, ICE connectivity, DTLS keying and media flow in that order. Some stages overlap, but this sequence prevents a media problem from triggering unrelated credential changes. Record the exact browser, operating system and client release. A reproducible result on one network and failure on another is more useful than a general statement that browser calling is unreliable.
A diagnostic order, not a strict application timeline: capture can start earlier and ICE gathering may be incremental. Successful signaling alone does not prove audio works.
Read counters with state
Inspect connection-state changes, the selected candidate pair, codec and inbound/outbound RTP statistics. Increasing bytes on a candidate pair may include control traffic; inspect media-specific counters too. Received RTP with no audible output points toward a different investigation from no incoming packets. Compare both endpoints or the browser and PBX. A server-side media count does not establish that the browser decoded and played the audio. If the call goes through a media relay or B2BUA, keep each leg's evidence separate and correlate it by the application's call identifier.
Use one controlled change
Repeat with a known audio device, then a different network, then a deliberate relay test as separate experiments. Changing all three at once may recover the call while leaving the cause unknown. Preserve diagnostics before reloading the page or clearing application state. After a fix, test incoming calls following an idle period, hold/resume, network change and device replacement. Keep a concise incident record: failing stage, evidence, bounded change and observed recovery. Do not include passwords, authorization headers or unnecessary audio recordings in a routine support export.
Watch the explanation
Explains why an audio packet can arrive yet be discarded before playback. This distinction helps separate network loss from jitter-buffer and timing problems.
Read applicability and editorial notes →Watch this video here
Conceptual browser-media discussion from 2024. Specific receiver algorithms and statistics vary. Review used the available transcript and primary references; audio and screen readability remain unverified.
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Follows candidate pairs in a live browser session, then finds the same selected pair in an exported diagnostic dump. This connects ICE terminology to an actual troubleshooting workflow.
Read applicability and editorial notes →Watch this video here
A March 2025 Chromium walkthrough with Philipp Hancke; browser diagnostic layouts can change. Review used the available transcript and primary references; audio and screen readability remain unverified.
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Sources & applicability
Primary references for the technical details above. Operational examples and planning checklists are VoIP.info editorial guidance.
Examples require adaptation to your topology. No live PBX or hardware testing is claimed.