How many types of Epabx are there?

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  1. #based
  2. #connected
  3. #there
  4. #types
  5. #phones
  6. #private
  7. #epabx
  8. #lines
  9. #automatic
  10. #technology
  11. #which
  12. #involved
  13. #branch
  14. #exchange
  15. #electronic
  16. #through
  17. #system
  18. #different
  19. #phone
  20. #systems
  21. #stands