What is did in SIP?

Related questions

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3. When was PBX invented?
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Tags

1. #existing
2. #across
3. #trunking
4. #analog
5. #business
6. #voice
7. #which
8. #video
9. #phone
10. #protocol
11. #unified
12. #connection
13. #network
14. #internet
15. #virtually
16. #communications
17. #standard
18. #replacing
19. #solution
20. #traditional
21. #lines
22. #trunk
23. #basis
24. #therefore
25. #installed