What is PSTN calling?

Related questions

1. How does IP phone system work?
2. Why should I use VoIP?
3. Does SIP use TCP or UDP?
4. Is VoIP cheaper than PSTN?
5. Do businesses use VoIP?
6. What is a star shaped symbol called?
7. How does IP telephony work?
8. What is IP telephony system?
9. Can Asterisk run on Windows?
10. How does office phone system work?

Tags

1. #switched
2. #skype
3. #cloud
4. #number
5. #telephony
6. #primary
7. #calls
8. #phone
9. #network
10. #connect
11. #receive
12. #provides
13. #public
14. #organization
15. #calling
16. #business
17. #users