How does a PBX work?

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  2. #internally
  3. #stands
  4. #phone
  5. #externally
  6. #users
  7. #channels
  8. #communicate
  9. #network
  10. #branch
  11. #voice
  12. #which
  13. #analog
  14. #private
  15. #organization
  16. #system
  17. #world
  18. #within
  19. #different
  20. #their
  21. #exchange
  22. #telephone
  23. #outside
  24. #company
  25. #communication