How does cloud telephony work?

Related questions

1. Why do we need VoIP?
2. What is PSTN and PBX?
3. Are VoIP calls free?
4. What is called Sip?
5. How is VoIP used?
6. How does IP phones work?
7. What is PBX phone?
8. Do I need a phone for VoIP?
9. How does SIP work with example?
10. What is a VoIP phone number used for?

Tags

1. #cloud
2. #computing
3. #servers
4. #solution
5. #hosted
6. #incoming
7. #business
8. #office
9. #means
10. #center
11. #longer
12. #outgoing
13. #calls
14. #system
15. #premise
16. #through
17. #primarily
18. #routed
19. #telephony
20. #managing