Browser Requirements for JustCall
Browser Requirements for JustCall
JustCall runs entirely in your web browser. Using a supported browser with the correct permissions is essential for reliable calling and messaging.
Available on: All plans
Supported browsers
| Browser | Minimum version | Recommended | Notes |
|---|---|---|---|
| Google Chrome | 90+ | Latest stable | Best compatibility — required for Chrome extension |
| Microsoft Edge | 90+ | Latest stable | Chromium-based Edge only (not legacy Edge) |
| Mozilla Firefox | 95+ | Latest stable | Supported but Chrome extension not available |
| Safari | 15+ | Latest stable | macOS only; some WebRTC limitations |
| Opera | 76+ | Latest stable | Chromium-based; Chrome extension compatible |
Not supported: Internet Explorer, legacy Edge, mobile browsers (use the JustCall mobile app instead).
Always keep your browser updated to the latest version. JustCall supports the two most recent major versions of each browser.
Required browser permissions
JustCall needs the following permissions to function. If any are blocked, specific features will not work.
| Permission | Required for | How to enable |
|---|---|---|
| Microphone | Making and receiving calls | chrome://settings/content/microphone — allow app.justcall.io |
| Notifications | Incoming call alerts and message notifications | chrome://settings/content/notifications — allow app.justcall.io |
| Pop-ups | Opening the dialer or call window | chrome://settings/content/popups — allow app.justcall.io |
| Clipboard | Copy-paste phone numbers and messages | Usually allowed by default; grant when prompted |
How to check permissions in Chrome
- Navigate to
app.justcall.io. - Click the lock icon (or tune icon) in the address bar.
- Review each permission and set to Allow.
- Reload the page after changing permissions.
WebRTC requirements
JustCall uses WebRTC for real-time voice communication. WebRTC is built into all modern browsers — no plugins or downloads are required.
For WebRTC to work correctly:
- UDP traffic must be allowed on ports 10000-60000 (for voice media).
- STUN/TURN servers must be reachable on UDP 3478 and TCP 5349.
- Browser extensions that block WebRTC (some privacy extensions disable WebRTC to prevent IP leaks) must be configured to allow JustCall.
To check if WebRTC is working, visit chrome://webrtc-internals during a call to see active connections.
Browser settings to verify
| Setting | Recommended value | Where to find it |
|---|---|---|
| Hardware acceleration | Enabled | chrome://settings/system |
| JavaScript | Enabled | chrome://settings/content/javascript |
| Cookies | Allow for justcall.io | chrome://settings/content/cookies |
| Auto-play | Allow for justcall.io | chrome://settings/content/sound |
Troubleshooting browser issues
If JustCall is not working as expected:
- Update your browser to the latest version.
- Test in incognito mode — if it works in incognito, an extension or cached data is causing the issue.
- Disable extensions one by one to identify conflicts.
- Clear cache and cookies for
justcall.io. - Check WebRTC — visit a WebRTC test site (e.g.,
test.webrtc.org) to confirm your browser supports it.