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The VoIP Troubleshooting Video Course
The video companion to this site: a complete, ordered course that teaches VoIP troubleshooting the way it is done on real tickets — capture first, theory second.
About the course
VoIP Troubleshooting: SIP, Audio & Quality is a 48-lesson video course (about six and a half hours) taught by Pinkal Desai, a working VoIP engineer. It follows the same method as the guides on this site — define the symptom, read the capture, isolate the fault — but in sequence, with packet captures and call flows walked through on screen, section quizzes, and downloadable cheat sheets including a one-page SIP call-flow reference.
The course is for IT staff who inherit phone problems, help-desk technicians moving into voice, small-business owners who administer their own systems, and engineers who want a structured troubleshooting method rather than a pile of disconnected fixes. No prior VoIP experience is assumed beyond basic networking.
What the course covers
- Section 1 — How a VoIP call actually works: the two conversations (SIP and RTP), codecs in plain terms, and the five numbers that decide call quality.
- Section 2 — Captures and toolkit: taking clean packet captures, Wireshark's telephony tools, and reading a SIP ladder under pressure.
- Section 3 — Reading SIP: requests, responses, dialogs, and decoding the error codes providers quote at you.
- Section 4 — The classic complaints: one-way audio, choppy calls, echo, robotic voice — each diagnosed end-to-end.
- Section 5 — NAT and the SBC: traversal failures, SIP ALG, firewall policy, and what a session border controller really does.
- Section 6 — QoS that works: DSCP marking, queueing, and proving a quality problem is congestion before buying bandwidth.
- Section 7 — Endpoints and provisioning: registration failures, rebooting phones, and configuration drift.
- Section 8 — The ticket-drill capstone: full-length faults worked from first report to verified fix, using the complete method.
How the course was produced
The curriculum, scripts, call flows and capture walkthroughs are the instructor's own, built from the same standards-first method as this site's guides and organized so each section ends able to do something the previous one could not. Lessons are short (four to seven minutes), narrated with disclosed AI-generated voiceover so the material can be revised and re-released as standards and platforms change, and every section carries a quiz and at least one downloadable reference — the SIP call-flow cheat sheet, the firewall checklist, and the capture-analysis worksheet among them. Students also get the troubleshooting method as a one-page field card: the workflow used across this site, condensed for the moment a ticket lands. All lessons carry captions, and the course is organized so working technicians can enter at the section matching their ticket queue — captures, signaling, media or endpoints — while newcomers can run it start to finish as a complete curriculum.
Enrollment
The course is published on Udemy, where it is listed at $89.99–$99.99 and, like most Udemy courses, is frequently discounted in platform sales. Enrollment includes lifetime access, all quizzes and resources, and a certificate of completion.
Transparency note: the course's lessons are narrated with AI-generated voiceover, as disclosed on its Udemy listing; the curriculum, scripts, captures and method are the instructor's own. Prefer to start free? The guides in our troubleshooting pillar cover the same method in writing.