Windows Instructions
- In the Skype for Business app, click on the Phone button (the button that looks like a dial pad).
- Using the dial pad, or with your keyboard, type in the phone number you are trying to reach.
- Click the Call button.
- If a Windows Defender pop up appears, click Allow Access.
- Your call will begin. When you are ready to hang up, click the red Hang Up button.
Mac Instructions
- In the Skype for Business app, click on the Calls button on the left.
- Using the dial pad, or with your keyboard, type in the phone number you are trying to reach.
- Click the Call button.
- Your call will begin. When you are ready to hang up, click the red Hang Up button.
Mobile Instructions
- In the Skype for Business app, tap on the Phone button at the top (the button that looks like a dial pad).
- Type in the number you are trying to reach.
- Tap the blue Call button.
- Your call will begin. When you are ready to hang up, tap the red Hang Up button.
Documentation
For more information, look at Microsoft's official instructions:
Make and receive calls using Skype for Business - Microsoft Support