Connect Claude Sonnet 4.5 to IntelDialix voice agents

How it works

How information moves between a live phone call and Claude Sonnet 4.5.

1. 01

   A call reaches your agent

   A caller dials a Twilio or SIP number assigned to the agent, or the agent places an outbound call from a campaign.

   Twilio / SIP number → IntelDialix agent

2. 02

   The agent uses Claude Sonnet 4.5 mid-call

   When the conversation needs data, the agent runs a custom tool: an HTTP request to Claude Sonnet 4.5 with the details it has collected.

   Custom tool → Streaming Tool Use API

3. 03

   The call ends with a record

   IntelDialix keeps the recording, transcript and post-call analysis for the conversation in your call history.

   Recording · transcript · analysis

4. 04

   Claude Sonnet 4.5 receives the result

   A signed webhook delivers the call event to your Claude Sonnet 4.5 endpoint, and is retried automatically if the delivery fails.

   HTTPS POST · X-Dialix-Signature

At a glance

Key figures

Voice engines

ElevenLabs · Vapi · Gemini

Choose the engine per agent and compare them on real calls.

Telephony

Twilio & SIP

Use numbers you already have, for inbound and outbound calls.

Call events

Signed webhooks

HMAC-SHA256 signature on every delivery, retried on failure.

Starter plan

$14 / month

One agent, one number and 100 calls a month.

Example

// Verify an IntelDialix webhook before trusting it in Claude Sonnet 4.5.
// Header: X-Dialix-Signature: t=<unix seconds>,v1=<hex>
// where v1 = HMAC-SHA256(secret, "<t>.<raw request body>")
import crypto from 'node:crypto';

export function verifyDialixWebhook(rawBody, signatureHeader, secret) {
  const parts = Object.fromEntries(
    signatureHeader.split(',').map((kv) => kv.split('='))
  );
  const expected = crypto
    .createHmac('sha256', secret)
    .update(`${parts.t}.${rawBody}`)
    .digest('hex');
  const valid =
    typeof parts.v1 === 'string' &&
    parts.v1.length === expected.length &&
    crypto.timingSafeEqual(Buffer.from(parts.v1), Buffer.from(expected));
  const fresh = Math.abs(Date.now() / 1000 - Number(parts.t)) < 300;
  return valid && fresh;
}

// Body: { "event": "call.completed", "payload": { ... }, "timestamp": "..." }

Check the signature before acting on an event in Claude Sonnet 4.5. The secret is the one you set when you add the webhook in IntelDialix settings.

FAQ

Frequently asked questions

Keep exploring

Related pages

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• integrationGoogle Gemini 3.8 Live Voice AI IntegrationUse Google Gemini Live for real-time, bidirectional voice conversations on IntelDialix phone lines.
• integrationOpenAI Realtime Voice AI IntegrationUltra-low latency speech-to-speech interaction powered by OpenAI Realtime models running over native WebSockets.