Anti-Vishing · Security & AIAnti-vishing for voice networks. Open Voice Shield checks every call on your SIP trunk for vishing and other scams, verifies caller ID across your routes and measures call quality, without touching the live conversation.
Transcript will appear here, caller and callee on separate channels.
A scam call transcribed and scored while the caller is still talking, then a caller ID check across four carrier routes: what was sent, what arrived, and which vendor changed it.
Vishing, or voice phishing, costs your subscribers their savings and costs you their trust. Tampered caller ID and fake answer supervision cost you margin on every minute. Open Voice Shield turns each call into a clear answer.
Every completed call gets a block, review or allow verdict with a fraud probability, a category and the red flags of a vishing script, such as urgency, bank or government impersonation, or a request for card details or one-time codes. Repeat callers can be blocked automatically.
See whether each carrier delivers caller ID intact, catch vendors that swap a live call for a looping recording to keep it billing, and spot call quality slipping on a route before your customers do.
Each call comes with a stereo recording, a speaker-separated transcript and the SIP trace, packaged into one report you can hand to a carrier, a customer or a regulator.
“Every single day, these shields protect people who will never know they were targeted. Their savings stay safe, their day goes on. We don’t know their names, but we’re so happy to see the difference it’s making.”
Fraud on a wholesale route does not always start with the caller. Open Voice Shield flags the vendor that rewrites caller ID, the one that keeps a call billing on a recording, and the leg where quality drops, so you can act before the month closes.
vn-04. Illustrative data.Open Voice Shield is a standard SIP hop on the trunk you already run. Calls pass through untouched and the analysis starts only after hangup, so it can never interrupt a live conversation.
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Whitelist your switch’s IP, add where calls should go next and route a trunk to the OVS ingress. It works with any SIP switch, SBC or PBX.
Signalling and media pass straight through. Nothing is injected into the audio and nothing changes for the people on the call.
Verdicts arrive within minutes of hangup, with alerts by email or Slack and signed webhooks straight into your own systems.
Already buying routes on the TCXC Marketplace? Put Open Voice Shield in front of your termination and get a fraud verdict and route integrity check on the same traffic, with no second interconnect to negotiate.
Open Voice Shield (OVS) is anti-vishing and AI fraud analysis for voice traffic, built and operated by TelecomsXchange. It sits as a transparent hop on the SIP trunk you already run and, after each call ends, returns a verdict of block, review or allow with a fraud probability, a category, the red flags found and a TCPA compliance note.
Vishing, or voice phishing, is a scam call that impersonates a bank, a government agency or a support desk to get card details, passwords or one-time codes. Open Voice Shield transcribes every call on the trunk and flags the signs of a vishing script, such as impersonation, urgency and requests for card numbers or codes, with a block, review or allow verdict. The analysis runs after hangup rather than cutting a live call; automation rules then block the caller from further calls, and alerts and webhooks let your team act on the same number across your network.
No. Signalling and media pass straight through so the call can be recorded, but nothing is injected into the audio and the analysis runs only after hangup. A failure anywhere in the analysis pipeline cannot interrupt a live call.
Three settings: whitelist your SIP server IP in the OVS portal, add the destination OVS should forward calls to, and point a trunk at the OVS ingress. There is no agent to install and nothing changes on the caller side. It works with any SIP-capable switch, SBC or PBX.
Automation rules can block or divert a caller once the fraud probability crosses a threshold you set, for as long as you choose. Alerts go out by email or Slack, and signed webhooks push every verdict into your own systems.
Yes. A CLI check places a real test call through each route to an OVS probe number and shows what was sent next to what arrived, marking each route as a match, modified, withheld or missing, with answer time and call quality alongside.
Yes. OVS watches the callee side of each call for a switch from live conversation to looping playback, the signature of a vendor keeping a call billing on a recording, and raises a route alert with a confidence score.
A stereo recording with caller and callee on separate channels, a speaker-separated transcript, the timestamped SIP trace and per-leg call quality. One analyst bundle packages it all with a report you can hand to a carrier, a customer or a regulator.
Transcription and analysis work across multiple languages including English, Spanish and French, and each verdict reports the language detected on the call.
Point one trunk at Open Voice Shield, make a test call and read the verdict the same afternoon.
Product site: ovs.telecomsxchange.com
