Does ISDN use PSTN?

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Tags

1. #network
2. #telephone
3. #switched
4. #called
5. #better
6. #single
7. #firms
8. #quality
9. #unlike
10. #transmission
11. #lines
12. #mostly
13. #digital
14. #circuit
15. #designed
16. #phones
17. #ordinary
18. #provides
19. #companies
20. #voice
21. #system
22. #which