How do I chat with an external network on Skype for business?

Related questions

1. Is Skype a part of Office 365?
2. How does Skype for Business Mobile work?
3. Does Skype for business have SIP?
4. How do I call Skype for business from Skype?
5. Can you put Skype for Business on your phone?
6. How do I install Skype for Business Web App?
7. How Skype for Business works technically?
8. Is a Skype account free?
9. Is there a way to use Skype without downloading it?
10. Can you use Skype to call international for free?

Tags

1. #specific
2. #admin
3. #office
4. #under
5. #individuals
6. #business
7. #users
8. #skype
9. #active
10. #properties
11. #communications
12. #center
13. #external
14. #click
15. #settings
16. #choose
17. #communication