How does a PBX telephone system work?

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Tags

  1. #business
  2. #telephone
  3. #calls
  4. #within
  5. #internal
  6. #public
  7. #making
  8. #number
  9. #users
  10. #telephones
  11. #switched
  12. #network
  13. #lines
  14. #trunks
  15. #connects
  16. #share
  17. #phone
  18. #providers
  19. #system
  20. #external
  21. #outside