How do I install a PBX phone system?

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Tags

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  2. #install
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  4. #outside
  5. #others
  6. #connects
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  8. #telephone
  9. #should
  10. #building
  11. #installed
  12. #lines
  13. #employees
  14. #number
  15. #share
  16. #certain
  17. #calls
  18. #system
  19. #ensure