This app was created for connecting to Zadarma video conferences. To use VoIP services (numbers, PBX) - download Zadarma app.

Zadarma Сonf is a simple video conferencing tool with tens of useful features. Communicate with remote offices, partners, clients, friends and family inside the app.
The app is created for smartphones and tablets with an ability to join a conference room via an invitation. Video conferences can be created in one click from a personal account on Zadarma.com.

Features:
- Supports up to 50 participants
- Video and audio encryption
- HD quality
- Instant access from any device
- Messaging and file sharing in a chat

Make sure that third-party apps are allowed on your device: go to Menu->Settings->Security-> and check "Unknown Sources"

Tap the APK file. Allow the app any required permissions it asks for. Then, at the bottom of the installer window, click INSTALL.

You'll see a confirmation the app is installed. Now you'll see the app available in your list of installed apps.