There are many words which are specific to PBX or PABX, or widely used in PABX industry. I thought I would try to list them :
1. PABX, PBX, EPABX
2. ISDN
3. PRI
4. Line card
5. Power supply
6. Number of ports
7. number of lines
8. trunk
9. network
10. master
11. slave
12. clock
13. trace
14. call trace
15. log
16. CDR
17. ACD
18. SS7
19. Analog
20. POTS
21. exchange
22. Telephone
23. Intercom
24. R2MF
25. MDF
26. TRUNK
27. Junction Box
28. PCM
29. E1
30. T1
To be updated !
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You might want to add “routing tree”, “call group”, “hunt group”, “mirrorred extension”…
To be continued…