Active testing for wholesale voice. QTest originates controlled calls across the route you want to verify, terminates them on infrastructure we control, and records what actually happened — signalling, media, identity and timing.
The problem
Between your switch and the ringing handset there may be six carriers. Each one is a place where a call can be answered early to start billing, where the Caller ID can be rewritten, or where a route sold as premium direct is quietly least-cost routed. Your billing record shows none of it.
destination +34 6xx xxx xxx disposition ANSWERED duration 00:00:42 cause 16 — Normal clearing billed 42 s verdict looks fine
200 OK at +3.10 s true answer never post-answer ringback, 42 s CLI sent +1 305 555 0142 CLI received +34 91 000 0000 media inbound only verdict CONFIRMED FAS
How it works
The difference between guessing and knowing is controlling the terminating side. When
QTest owns both ends of the call, it knows the exact moment the far end truly answered
— so a premature 200 OK is not an inference, it is a measurement.
Capabilities
Each test produces a complete technical record, not a pass/fail flag.
Because QTest controls the terminating side, the true answer moment is known. A 200 OK that arrives before it is measured, not guessed.
What you sent, against what actually arrived — compared across every identity header, because carriers often rewrite only one.
A known reference signal is played from the far end, so received audio is compared against what was truly sent.
The full dialogue with millisecond timestamps, rendered as a ladder diagram, with anomalies called out.
A per-call capture, filtered to that call alone, that opens in Wireshark with no post-processing.
Every stage of setup, and the gap that matters most: signalled duration against real media duration.
Transport measured from the packets themselves, separating a routing problem from a network problem.
Turn testing into a standing part of NOC operations rather than something done after a complaint.
The same destination across several vendors, side by side, so routing decisions rest on measurements rather than on price per minute alone.
Disputes
A claim without evidence is a conversation. A claim with SIP traces, recordings and PCAPs is a credit note. QTest assembles the whole file for you.
Integration
Everything the portal does is available over a versioned REST API with an OpenAPI 3.1 specification, scoped API keys, signed webhooks and a sandbox that returns realistic results without placing a single billable call.
QTest
{
"route_id": "rt_es_mobile_premium",
"destination": "+346XXXXXXXX",
"ani": "+13055550142",
"codecs": ["g729", "ulaw"],
"topology": "controlled_termination",
"webhook_url": "https://noc.example/qtest"
}
→ 202 Accepted
{ "test_id": "tst_01J8ZQ…", "state": "queued" }
{
"test_id": "tst_01J8ZQ…",
"outcome": "completed",
"fas": {
"verdict": "confirmed_fas",
"rules": ["FAS-1", "FAS-4"],
"answer_gap_ms": 2810
},
"cli": { "result": "replaced" },
"timings": { "pdd_ms": 1840 },
"artifacts": ["recording", "pcap", "sip_trace"]
}
Early access
We are onboarding a small number of carriers and wholesale operators to shape the platform before general availability. If you route international voice and you have ever suspected a vendor without being able to prove it, we would like to talk.
QTest is pre-release. Capabilities on this page describe the platform as specified; availability by phase is shared during onboarding. Test calls are real calls — customers confirm they are authorised to test the destinations they select.