How does IP PBX work?

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  1. #computers
  2. #softphones
  3. #consists
  4. #includes
  5. #server
  6. #optionally
  7. #phones
  8. #running
  9. #directly
  10. #system
  11. #gateway
  12. #phone
  13. #connect
  14. #network
  15. #clients
  16. #through