What is PBX number?

Related questions

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6. What is a test phone number?
7. How much does intercom cost?
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Tags

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