Your extension, wherever you are.

One app for your desk phone line: it rings on your computer and your phone, shows which company the caller reached, and keeps a log of every call. Nothing else — no chat, no clutter.

Version 2.56 · 2026

Windows

Windows 10 or newer

Run the installer and it adds itself to the Start menu and desktop. Closing the window leaves it running beside the clock, so calls still ring.

Download installer

Version 2.56 · 132 MB

macOS

macOS 12 or newer

Open the disk image and drag the app to Applications, then allow it once — see below.

Download for Mac

Version 2.56 · 140 MB

Android

Android 7 or newer

Install the APK, then allow background running so calls ring.

Download APK

Version 2.56 · 39 MB

iPhone

iOS 15 or newer

Apple does not allow installing from a website, so the iPhone app is delivered through TestFlight. Ask for an invite.

Request TestFlight invite

Six ringtones ship with the app, chosen per company so you know whose line is ringing — hear them all.

After you install

Sign in

Open the app.
Enter your company name, extension and password — your administrator provides these.
Enter the server address and port your administrator gave you.

Android: let it ring

Allow notifications and the microphone when asked.
Tap "Fix" on the banner if it appears — that allows background running.
Allow full-screen calls so the phone rings on the lock screen.

If Windows or macOS blocks it

Windows: choose "More info" then "Run anyway".
macOS: open it once and let it be refused, then go to System Settings → Privacy & Security, scroll down and choose "Open Anyway".
Or from Terminal: xattr -dr com.apple.quarantine "/Applications/LS3 Bridge.app"
Right-clicking and choosing "Open" no longer works on recent macOS — Apple removed it.