What is a legacy phone system?

Related questions

1. What is legacy PBX?
2. Why should I use VoIP?
3. What is the difference between VoIP and SIP?
4. What is Skype for Business Cloud PBX?
5. What is AsteriskNOW?
6. Why do we use SIP protocol?
7. Does SIP use TCP or UDP?
8. Can Asterisk run on Windows?
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Tags

1. #these
2. #features
3. #based
4. #outdated
5. #lines
6. #phone
7. #typically
8. #systems
9. #expensive
10. #system
11. #legacy
12. #connected
13. #modern
14. #company
15. #traditional
16. #maintain
17. #consists
18. #reality
19. #mobility
20. #technology
21. #deliver