What is PBX?

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  1. #allowing
  2. #certain
  3. #users
  4. #exchange
  5. #number
  6. #share
  7. #switches
  8. #between
  9. #local
  10. #calls
  11. #telephone
  12. #branch
  13. #enterprise
  14. #while
  15. #lines
  16. #external
  17. #phone
  18. #system
  19. #within
  20. #private