Voice agents that sound human

Build AI agents that answer phones, qualify leads, and book appointments — with sub-second responses and natural interruptions. $10 free credits to start.

Start building free Speech-to-Text API<800ms responses · No card required

Hear a live call

Live call · Ava, an agent voiced by the platform itself

OpenAIAnthropicDeepgramElevenLabsCartesiaTwilioGroqCerebrasOpenAIAnthropicDeepgramElevenLabsCartesiaTwilioGroqCerebras

AGENTS

From prompt to phone call — in three steps.

Katy

Front desk

John

Sales

Sarah

Real estate

Katy

Front desk

John

Sales

PHONE NUMBER

Create your agent

Write a prompt or draw a flow on the visual canvas. Pick a voice, language, and the AI models you want.

Connect a number

Plug in your Twilio number for inbound & outbound calls — or embed web voice straight into your product.

Go live & monitor

Watch transcripts, latency traces, QA scores and per-call costs in real time. Iterate the same day.

<800msvoice-to-voice response

40+AI models behind one API

160+API endpoints

$0.03per minute, billed per second

CALL CENTER

One console for your whole call center

Add AI & human agents

Mix AI and human agents in one roster. AI answers first; people stay on standby.

Watch live conversations

Every word transcribed in real time — follow any call as it happens.

Transfer between call agents and human agents

When a caller needs a person, the AI hands off mid-call with full context.

DTMF keypad support

Callers press keys for menus, PINs and confirmations — the agent reads every tone.

Flag inappropriate content

Abuse, threats and policy breaches are caught mid-call — flagged, redacted and escalated in real time.

Score every call

After hangup, each call is auto-graded on resolution, tone and compliance.

InfraVoice · Call Center

Support Desk · Agents

Support Desk

Agents

+ Add agent

Ava

AI · answers every call first

On call

Kai

AI · overflow & after-hours

Idle

Maria Santos

Human · Tier 2 support

HUMAN

Available

James Okafor

Human · billing

HUMAN

Busy

Everything a voice agent needs

Production-grade pieces, already wired together.

Visual Flow Builder

Design conversations on a canvas — welcome, questions, branching, transfer and end-call.

agent.flow · Draft

## GREETING
Welcome the caller, confirm their name.
## QUALIFY
Ask what they're calling about

Real Phone Calls

Inbound & outbound telephony on your own number, with voicemail detection and human transfer.

InfraVoice Line

+1 (415) 555-0132

InboundOutboundTransfer

Sub-second Turnarounds

A streaming ASR → LLM → TTS pipeline tuned per-millisecond, with latency tracing on every turn.

0:00 / 0:42

ASR 90msLLM 210msTTS 112ms412ms first token

Analytics & QA Scoring

Full transcripts, timing breakdowns and automatic QA scoring across every conversation.

Avg QA score92.4%

MonSun

Pay-as-you-go Wallet

No subscriptions. Top up via Stripe, pay per minute billed by the second — every call itemized.

Call · 2:14$0.07

Call · 0:48$0.02

Call · 5:31$0.17

Today$2.41

$10.00 free credit remaining

<800ms

40+

160+

$0.03

<800ms

Voice-to-voice response

A streaming ASR → LLM → TTS pipeline tuned per-millisecond — callers never wait, and interruptions feel natural.

Simple, usage-based pricing

No subscriptions. No seats. Pay only for the minutes you use — every call itemized, invoices included.

$0.03/ minute, billed per second

✓$10 free credits on signup

✓Web voice + real phone calls

✓All features included — flows, call center, analytics

✓Bring your own AI provider keys

Claim your $10 free

your next call, answered by AI.

Create an agent and hear it speak in under five minutes

↳Get started — it's free

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