What is PBX phone?

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