What is legacy PBX?

Related questions

1. What is PSTN calling?
2. Is VoIP cheaper than PSTN?
3. What is Microsoft Cloud PBX?
4. How does IP phone system work?
5. Can Asterisk run on Windows?
6. What is a star shaped symbol called?
7. What is the difference between VoIP and SIP?
8. What is the benefit of SIP?
9. Is 3cx open source?
10. Why do we use SIP protocol?

Tags

1. #phone
2. #gaining
3. #phonepower
4. #power
5. #while
6. #features
7. #current
8. #retain
9. #benefits
10. #offer
11. #system
12. #connect
13. #linksys
14. #existing
15. #spa8000
16. #service
17. #legacy
18. #knowledge
19. #enable