TCXC Open Voice Shield

Scam call prevention with frontier intelligence.

One SIP hop that records, transcribes and scores every call. Nothing to install.

A one-unit Open Voice Shield gateway: twelve ports, a readout showing a block verdict Open Voice Shield OVS-1U · 12 PORTS · SIP PWR SYS ALM 01 02 03 04 05 06 07 08 09 10 11 12 P07 +1 415•••0148 → +1 212•••"read me the card number"BLOCK 95% card services scam
allowreviewblockagent Illustrative traffic.

Every call, a verdict.

A call detail in Open Voice Shield: a 95% high-risk verdict titled "Fake 'card services fraud department' harvests card number and CVV under a five-minute deadline", tagged Credit card scam and Block, with five numbered red flags, a TCPA comment, a written summary, a Block recommendation, the stereo recording, and the speaker-labelled transcript of the call.

GET /api/calls/{id}/analysis 200 application/json

{
  "title": "Fake 'card services fraud department' harvests card number and CVV under a five-minute deadline",
  "probability": 95,
  "category": "credit_card_scam",
  "recommendation": "block",
  "entity": "'Card Services fraud department'",
  "red_flags": [
    "1. Caller creates urgency by claiming the disputed charge becomes final and the callee liable within five minutes.",
    "2. Caller asks for the full sixteen-digit card number and the three-digit security code, which a real issuer never requests on an outbound call.",
    "3. The organisation is a vague front ('Card Services', 'the fraud department'); no bank or card network is ever named.",
    "4. Caller refuses to give a call-back number and claims the case 'closes automatically' if the callee verifies independently.",
    "5. Fear tactic: an unauthorised purchase in another city is presented as proof the card is 'compromised' before any details are checked."
  ],
  "language": "en",
  "tcpa_comment": "No genuine company identification, no purpose beyond the pretext, no call-back number and a refusal to let the callee verify. Not a marketing call, so opt-out rules do not apply; the conduct is fraudulent rather than merely non-compliant.",
  "summary": "The caller poses as a card-issuer fraud investigator, reports a $499 purchase in Miami and pressures the callee to read out her card number and CVV within five minutes to 'block' it. The callee declines and says she will call the number on her card.",
  "keywords": [
    "card number",
    "security code",
    "fraud department",
    "urgency",
    "unauthorized charge",
    "call-back refused"
  ],
  "route_alert": null,
  "qos": {
    "mos": 4.3,
    "packet_loss_pct": 0.0,
    "jitter_ms": 0.6
  }
}
The same verdict as the portal shows it and as the API returns it, every field typed. Seeded demo account.

See it work.

A frame of the launch film: the Live page of the customer portal with a lit port and the line inspector showing packets flowing on both media legs. Play the film 1:03
Every screen is the real product.

Block the next call automatically.

The Automation page: rules such as "block confirmed scam ANI for 24 hours" at 90% probability and "divert review-grade callers to the QA queue for 4 hours" at 70%, each with an action, a duration and a status; below, a table of currently controlled caller numbers with the action, the rule that set it and when it expires.
Rules run the moment a verdict lands. Features

One hop. Any SIP switch.

Signalling and media path through Open Voice Shield Two lanes leave your switch: the SIP signalling lane passes through the Open Voice Shield SIP proxy and the same INVITE is relayed, unchanged, to your destination; the RTP media lane flows in both directions through the media server, where a pcap tap records it. Nothing is injected into the live audio. Below a dividing line marked “after the BYE”, an asynchronous pipeline decodes the pcap to a stereo WAV, transcribes it with one channel per party, runs language-model analysis and ends in one verdict: block, review or allow. Your switch, SBC or PBX the trunk you already run INVITE RTP Open Voice Shield ingress SIP proxy IP auth, routing no B2BUA in path anchors the media Media server RTP in and out pcap tap same INVITE, unchanged RTP, nothing injected Your destination or carrier wherever your rules send it AFTER THE BYE a fault down here can never touch a live call pcap decoded to stereo WAV transcribed, channel per party language-model analysis BLOCK REVIEW ALLOW
How it works

$0.08

a three-minute call, analyzed. Pricing

Put one call through it.

$5 of credit. No card.