What is SIP calling?

Related questions

1. Is ISDN a VoIP?
2. What is called Sip?
3. How does a virtual PBX work?
4. How does VoIP work at home?
5. How does cloud telephony work?
6. What is the difference between PSTN and VoIP?
7. Can VoIP calls be traced?
8. What is PSTN used for?
9. Does VoIP use PSTN?
10. Are VoIP calls free?

Tags

1. #multiple
2. #instead
3. #current
4. #systems
5. #connection
6. #lines
7. #physical
8. #voice
9. #company
10. #initiation
11. #phone
12. #stands
13. #there
14. #session
15. #regular
16. #protocol
17. #works
18. #internet
19. #installed
20. #virtually
21. #trunk