Voice Automation API

Build reliable AI phone calls, not call-center glue code.

Start outbound calls, handle IVR/queue workflows, stream transcripts, and run human handoff flows from one API.

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Built on Twilio OpenAI Realtime ElevenLabs + Azure TTS

Quickstart

Base URL: https://call-my-call-backend.fly.dev

curl -X POST https://call-my-call-backend.fly.dev/v1/start-call \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"phone_number":"+46700000000","task":"Confirm booking","language":"en","webhook":"https://example.com/cmc"}'

{
  "success": true,
  "sid": "CA1234567890abcdef"
}

Then receive call_completed and optional transcript events on your webhook.

Integration model

REST + Webhooks

Start calls synchronously, process outcomes asynchronously.

Call control

Realtime

Activate AI mid-call, transfer warm/cold, drop user leg.

Outputs

Transcripts

SSE streaming plus final call summary and recording URL.

What You Can Build

See endpoint reference

IVR Navigation

Handle DTMF trees, queue announcements, and callback-style flows.

Human-in-the-loop

Start in user-on-call mode and activate AI when needed.

Ops automation

Run confirmation, cancellation, and scheduling calls with webhook outcomes.

Recorded QA

Fetch signed recording URLs and transcript streams for QA tooling.

Regional workflows

Set language per call and keep caller ID verification compliant.

Usage-governed calling

Credit controls, billing APIs, and dashboard visibility for teams.

How It Works

Open quickstart

1. Start call

Send task, destination, and optional webhook settings to /v1/start-call.

2. Track progression

Use webhook events and optional transcript SSE for realtime visibility.

3. Fetch assets

Read call details and signed recording URLs when calls complete.

Developer-ready Defaults

Webhook delivery contract

Area	Default behavior
Webhook success	Any HTTP 2xx marks delivery successful.
Webhook retries	3 attempts total; retry on network/5xx, no retry on 4xx.
Recording access	Signed URL returned from `/v1/calls/:callSid/recording`.
Call billing	Provider usage converted to credits and rounded per call.

Start Building

Create an account, generate an API key, and run your first call in minutes.

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