New from TelecomsXChangeAI fraud analysis on the SIP trunk you already run. Block, review or allow, with the evidence to prove it.
Transcript will appear here, caller and callee on separate channels.
Fraud on a voice route is expensive twice: once when it happens and again when you have to prove it. Open Voice Shield covers both.
Every completed call is decoded, transcribed per speaker and scored by a language model. You get a recommendation, a probability, a fraud category, the caller identity claimed on the call, a red-flag list (urgency, fear tactics, PII harvesting and more) and a TCPA compliance note.
Act on a verdict without a human in the loop. Automation rules block or divert a caller when the probability crosses your threshold, for as long as you choose. Blocked callers get a SIP 403.
What you can hand to a carrier, a customer or a regulator. A stereo recording with caller left and callee right, a timestamped SIP ladder, the raw media pcap and per-leg quality metrics, all zipped into one analyst bundle.
OVS is a standard SIP proxy with a media server anchoring RTP so the call can be recorded. The call is proxied, not re-originated, and the analysis only starts after the BYE.
Your switch routes the call to the OVS ingress. SDP is required; calls without it get a 488.
The caller IP is matched against your CIDR whitelist, then account status, concurrency and balance are checked.
Connection info in the SDP is rewritten so RTP flows through the media server, which writes a pcap per stream while relaying.
Longest-match prefix rule, whitelisted destination, account default or callback to the source IP. Custom SIP headers are captured to indexed CDR columns.
A BYE from either side tears down media and reports the call metrics to the API.
RTP streams are parsed, G.711 is decoded to PCM, gaps are filled and a stereo 8 kHz WAV is written.
Each channel is transcribed separately so every line is attributed to caller or callee.
A language model scores the transcript and metadata and returns the block, review or allow verdict.
Fees are charged, alerts and automation rules fire, and signed webhooks are posted.
Because analysis runs after the call, a failure in the pipeline can never interrupt a live conversation.
Fraud on a wholesale route does not always come from the A-number. Delayed-playback false answer supervision is a vendor swapping the callee to a looping recording mid-call so the billing keeps running. Open Voice Shield watches the callee channel for exactly that switch from interactive conversation to playback and raises a route alert with a confidence score.
Alongside it, every leg gets an estimated MOS from the E-model, jitter and packet loss, and the worst leg lands on the CDR so a degrading route shows up in the table, not in a complaint.
vn-04. Illustrative data.If it speaks SIP it works with Open Voice Shield. There is no agent to install, no digest credentials to manage and nothing changes for the people on the call.
Add your SIP server public IP as a CIDR entry. Authentication is by source IP, per tenant, and overlapping entries across tenants are rejected.
Tell OVS where to forward: the host, port and transport of your switch or carrier. Add prefix rules if different destinations need different handling.
Send traffic to the ingress on the Network page over UDP or TCP on port 5060. Make a test call and read the verdict the same afternoon.
Already buying routes on the TCXC Marketplace? Put Open Voice Shield in front of your termination and you get a fraud verdict and route integrity check on the same traffic, with no vendor lock-in and no second interconnect to negotiate.
Analysis is one fixed piece of work per call, so it is billed per call rather than per minute. Pick the AI depth in the portal and it applies to new calls instantly.
No monthly fee, no concurrency limit. 60-second then 1-second billing increments.
A 3-minute call on pay-as-you-go: $0.08 Economy, $0.11 Power, $0.21 Max.
Bundles bill in 6-second then 1-second increments. Leaving one mid-cycle credits the unused part.
Full pricing and FAQOpen Voice Shield (OVS) is an AI-powered SIP fraud analysis service built and operated by TelecomsXChange. It sits as a transparent hop on your existing SIP trunk, records and transcribes each call after it ends, and returns a verdict of block, review or allow with a probability score, a fraud category, the red flags found and a TCPA compliance note.
No. Signalling is proxied and RTP is relayed through the OVS media server so the call can be recorded, but nothing is injected into the audio and the analysis runs asynchronously after hangup. A failure anywhere in the analysis pipeline cannot interrupt a live call.
Three things: whitelist your SIP server public IP in the OVS portal (CIDR based, per tenant), add the destination OVS should forward to (your switch or carrier host, port and transport), and point a trunk at the OVS ingress shown on the Network page. There is no digest authentication, no agent to install and no change on the caller side. It works with any SIP-capable switch, SBC or PBX.
Pay-as-you-go is $0.02 per minute plus a per-call analysis fee that depends on the AI mode: Economy $0.02, Power $0.05 (default) or Max $0.15. A 3-minute call on Power costs $0.11. Starter, Business and Enterprise bundles add included minutes, concurrent ports and lower per-minute rates for a monthly fee. Every new account starts with a US$5 credit and no card is required.
Automation rules block or divert a caller when the probability crosses a threshold you set, for a duration you choose. Blocked callers receive a SIP 403. Email alerts match on probability, category, recommendation or call quality, and HMAC-SHA256 signed webhooks let you push verdicts into your own systems.
A stereo WAV recording with the caller on the left channel and the callee on the right, a speaker-separated transcript, a timestamped SIP ladder with full headers, the raw media pcap and per-leg quality metrics (estimated MOS, jitter, packet loss). An analyst bundle zips all of it with an HTML report so you can hand a case to a carrier, a customer or a regulator.
Yes. The route integrity check watches the callee channel for a mid-call switch from interactive conversation to looping playback, which is the signature of delayed-playback FAS where a vendor swaps to a recording to keep billing. Route alerts carry a confidence score so you can act on a vendor before the month closes.
Media is G.711 (a-law and u-law) decoded to PCM for transcription; other codecs are not analysed yet. Transcription and analysis work across multiple languages including English, Spanish and French, and the verdict reports the language detected on the call.
Every new account starts with US$5 of credit and no card. Whitelist an IP, point a trunk, and see what your traffic looks like with a verdict on every call.
Product site: ovs.telecomsxchange.com · Call path details: how it works
