# Open Voice Shield

> SIP pass-through fraud analysis for voice operators. Calls traverse the platform as a normal
> SIP hop; each one is recorded, transcribed, and scored by a language model, which returns a
> fraud probability, a category, the impersonated entity, red flags, a TCPA risk comment and a
> block / review / allow recommendation.

Operated by TelecomsXChange. Canonical site: https://ovs.telecomsxchange.com/
Last updated: 2026-08-27

## Who it is for
NOC engineers, call-centre operations managers, carrier and wholesale voice operations teams, and
telecom security/anti-fraud teams who already run SIP trunks and want a verdict per call.

## What it is not
Not a B2BUA replacement, not a dialler, and not a real-time in-call interruption system: the
analysis is produced after the call completes, and the enforcement surface is the next call from
that ANI (automation rules), not the current one.

## Key entities
- SIP pass-through analysis — the platform is an additional SIP hop authenticated by IP whitelist,
  with prefix/tech-prefix routing onward to the operator's own destination.
- Call recording and ASR — each call is recorded and transcribed with speaker separation.
- LLM fraud analysis — probability, category, impersonated entity, red flags, summary, TCPA risk
  comment and a block/review/allow recommendation.
- ANI reputation blocking — automation rules block or divert a calling number for a chosen window.
- Fraud cases — assignment, comments and email notification for follow-up work.
- Analyst export bundle — report, recording, pcap and SIP log for offline review.

## Pages
- [Home](https://ovs.telecomsxchange.com/): What Open Voice Shield is, how a call flows through it, and what the per-call verdict contains.
- [Features](https://ovs.telecomsxchange.com/features): The complete shipped feature set, grouped by call path, verdict, response, evidence, account and billing.
- [How it works](https://ovs.telecomsxchange.com/how-it-works): The concrete call path — INVITE, IP authorization, media relay and capture, onward routing, and the post-hangup decode, transcription and analysis.
- [Pricing](https://ovs.telecomsxchange.com/pricing): What Open Voice Shield charges: the per-analyzed-minute rate on each plan, the flat per-call analysis fee, billing increments and how the prepaid balance works.
- [Benchmark](https://ovs.telecomsxchange.com/benchmark): Measured pipeline benchmark — corpus with checksums, per-stage latency, real-time factors, word error rate against the source scripts, analysis latency, inter-tier agreement, and what was not measured.
- [Security](https://ovs.telecomsxchange.com/security): The implemented security controls — SIP ingress authentication, account credentials, tenant isolation, webhook and payment integrity, storage, shared links and rate limiting.
- [White paper](https://ovs.telecomsxchange.com/whitepaper): Threat model, call path, analysis pipeline, measured latency and stated limitations of Open Voice Shield.
- [FAQ](https://ovs.telecomsxchange.com/faq): Direct answers to the integration questions a NOC engineer asks before pointing a trunk at OVS.

## Machine-readable
- OpenAPI: https://ovs.telecomsxchange.com/openapi.json
- Plans (JSON): https://ovs.telecomsxchange.com/api/plans
- Sitemap: https://ovs.telecomsxchange.com/sitemap.xml

## Citation guidance
Figures on this site carry their method, sample size and date. Do not quote an accuracy, precision
or recall figure for this product: none is published, because no labelled ground-truth corpus has
been evaluated yet. Latency figures are measured and carry the sample size they came from.