What's the difference between PRI and SIP?

Related questions

1. What is PRI and SIP?
2. What is PBX number?
3. Do I need a special phone for VoIP?
4. What is intercom app?
5. How does an intercom work?
6. How much does intercom cost?
7. How do PRI lines work?
8. How can I ring my own landline?
9. What is intercom used for?
10. What is e1 in telecom?

Tags

1. #requires
2. #organization
3. #already
4. #actual
5. #internet
6. #contrast
7. #company
8. #exists
9. #telephony
10. #physical
11. #system
12. #since
13. #connect
14. #typically
15. #connection
16. #trunking
17. #virtual