Telecom diagnostics · in your browser

Find what broke the call.

A diagnostic console for browser-based softphones and UCaaS platforms. Drop a HAR, get a senior-engineer-grade verdict on calls, WebRTC, SIP and queue state — in seconds.

parsed 3,471 reqs · 12 dialogs
Capabilities

Sixteen analyses, one drop.

Telecom·HAR groups requests into sessions, reconstructs SIP dialogs, decodes SSE event streams and pulls every signal that explains a failed call.

AI session report

Generate a senior-engineer write-up of the session in seconds — root cause, evidence, fix recommendation. Optional, runs through your own API key.

Calls & SIP

Reconstructs every dialog from dialog-info events. Detects stuck presence, terminated-without-identity bugs, zombie sessions.

REGISTER · INVITE · BYE · NOTIFY

WebRTC / TURN

ICE candidates, TURN allocation, DTLS, MOS estimate.

ICE · DTLS · STUN

Queue / ACD

Agent state, wrap-up timing, missed-call attribution.

SKILLS · ROUTING

Headset & Audio

HID claim conflicts, mute mismatches, call-control desync.

HID · USB · BLE

Compare sessions

Drop two HARs to diff timings, errors and dialog outcomes.

WORKING847ms−312
BROKEN1.16s+38%

Auth & JWT

Token lifecycle, refresh windows, expiry collisions with calls.

OIDC · JWT · COOKIE

Security headers

CSP, HSTS, CORP, COEP, COOP — graded per-domain with fixes.

CSP · HSTS · CORP

SMS & messaging

Delivery receipts, MMS attachments, conversation rebuild.

SMS · MMS · MATRIX
How it works

Three steps to a verdict.

01

Capture

In the user's browser, open Network → enable "Preserve log" → reproduce the issue → right-click → Save all as HAR with content.

02

Drop

Drag the .har onto the analyser. The file never leaves the device. Even very large captures (500MB+) load with the optional body-stripping mode.

03

Read

Sidebar badges flag where the issues are. Open the AI report for the executive summary, or dig into per-dialog SIP and WebRTC traces.

Privacy by design

Your data never leaves this device.

Built for support engineers handling real customer captures. Zero servers, zero accounts, zero audit risk.

Nothing is uploaded

HAR files are parsed entirely in your browser. Zero network requests leave this page during analysis.

No cookies, no tracking

No analytics, no third-party scripts. Settings persist in localStorage on this device only.

Works offline

Save the .html file once, run it on an air-gapped machine forever. No external dependencies at runtime.

Auditable in minutes

One static HTML file, no build step. Read every line of source before you trust it with customer data.

Stop guessing. Start analysing.

The fastest path from "the call dropped again" to "here's the line where it failed."