Evidence
Methodology
Every number on this site should be checkable. This page states how the latency figure is measured, what the ROI calculator assumes, and — just as importantly — what VoxFlow does not do yet.
Latency: ~200ms server turn
The published figure is a server turn, timed inside the API process on every real call and persisted per call as calls.avg_turn_latency_ms. Percentiles come from those persisted rows, not from a synthetic benchmark.
Included in the measurement
- Webhook signature verification
- DID-to-tenant routing and subscription entitlement check
- The LLM turn (Groq openai/gpt-oss-20b)
- Every tool call it triggered — stock, PO, dock booking, Sheets write
- Transcript persistence
Not included
- Amazon Lex speech-to-text (runs inside the Connect contact flow)
- Amazon Polly synthesis and audio playback to the caller
- PSTN transit between the caller's handset and Amazon Connect
- Amazon Connect contact-flow block overhead and Lambda invocation
Because speech-to-text and audio playback happen inside Amazon Connect, the time a caller actually perceives is higher than the server turn. We do not describe this number as glass-to-glass or mouth-to-ear. The 84ms / 112ms / 196ms component figures shown in the Voice X-ray widget are per-stage timings from the same pipeline, not an end-to-end total.
ROI calculator assumptions
The calculator is a model, not a quote or a guarantee. It assumes a fully-loaded operator cost of £14/hour, a VoxFlow cost of roughly £0.12/minute of call time, and 90% automation containment — meaning one call in ten still reaches a human. Change any of those and your result changes. Your real containment rate depends on how varied your inbound calls are and how complete your catalogue data is.
What is not live
Stated plainly, so nothing is discovered after a contract is signed.
Outbound / campaign calling
Not liveThe durable campaign worker ships disabled with an empty tenant allow-list and dry-run on by default. Outbound is not sold and cannot be enabled by self-serve signup.
Languages other than English
Not liveSpeech-to-text, the agent prompt, and text-to-speech are all English (en-GB) only. Hindi and Hinglish are not available.
SMS / WhatsApp delivery
Logged, not deliveredThe agent records notification intent against the call, but no SMS or WhatsApp provider is wired for delivery yet. Treat these as call-log entries.
SOC 2
Not heldVoxFlow does not claim SOC 2. Data residency, DSAR export/erasure, and automated retention purge are implemented and documented under UK GDPR.
What is live
Inbound English (en-GB) calls on a routed UK DID, answered by the agent with stock lookup, purchase-order status, shipment tracking, dock-slot booking, caller PIN verification, and human escalation. Call outcomes persist to PostgreSQL in AWS London (eu-west-2) and mirror to your connected Google Sheet during the call. Billing runs on Stripe with metered minutes.