How do I call Skype for business from Skype?

Related questions

1. Is there a way to use Skype without downloading it?
2. Can you call on Skype for Web?
3. Can you use Skype on Web?
4. How do I make a call on Skype Web?
5. How does Skype for Business Mobile work?
6. What is the Skype web app?
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Tags

1. #person
2. #picture
3. #click
4. #contacts
5. #skype
6. #switch
7. #button
8. #application
9. #business
10. #organization
11. #contact
12. #enter
13. #username
14. #field
15. #search