# Audio Messages

> Send WhatsApp audio messages: MP3, OGG or M4A up to 16MB. Voice notes, podcasts and transcribed messages delivered in conversations.

Send audio files for voice announcements, podcasts, or audio instructions.

## Send an Audio Message

```typescript
const message = await zavu.messages.send({
  to: "+14155551234",
  channel: "whatsapp",
  messageType: "audio",
  content: {
    mediaUrl: "https://example.com/announcement.mp3"
  }
});
```

```bash
curl -X POST https://api.zavu.dev/v1/messages \
  -H "Authorization: Bearer zv_live_xxx" \
  -H "Content-Type: application/json" \
  -d '{
    "to": "+14155551234",
    "channel": "whatsapp",
    "messageType": "audio",
    "content": {
      "mediaUrl": "https://example.com/announcement.mp3"
    }
  }'
```

## Specifications

| Property | Requirement |
|----------|-------------|
| Formats | AAC, MP3, MP4, AMR, OGG |
| Max size | 16 MB |
| Caption | Not supported |

> **Note:**
> Audio messages do not support captions. If you need to add context, send a text message before or after the audio.

## URL Requirements

Your audio URL must:

- Be publicly accessible (no authentication)
- Use HTTPS
- Return the correct `Content-Type` header
- Be available for at least 24 hours

## Use Cases

- Voice announcements
- Audio instructions
- Podcast episodes
- Voice notes
- Music samples