# Ringtone Audio Files

## Custom Ringtone

To add a custom ringtone for incoming calls in the browser phone:

1. Place your ringtone audio file in this directory
2. Name it: `ringtone.mp3`
3. Recommended format: MP3, under 5 seconds, loopable

## Fallback Behavior

If no ringtone file is present, the browser phone will:
- Use device vibration on mobile devices (Android, iOS)
- Rely on browser notifications to alert users
- Display visual indicators in the browser interface

## Supported Audio Formats

- **MP3** (recommended) - Best compatibility across browsers
- **OGG** - Good for Firefox, Chrome
- **WAV** - Larger file size but universal support

## File Requirements

- Maximum file size: 100KB recommended
- Duration: 1-5 seconds (will loop)
- Sample rate: 44.1kHz or 48kHz
- Bitrate: 128kbps or higher

## Example Ringtone Sources

You can find free ringtone files at:
- https://freesound.org/
- https://incompetech.com/
- Or create your own using Audacity or similar tools