PBX
- Scales highly >50 users
- Typically digital end-points, Propriatory to PBX manufacturer
- Trunks to PSTN
1. Terminal interface (lines, handsets, trunks)
2. Switching network (enables path between end-points)
3. Control Complex (logic, memory, call processing)
Key System
- Less scaleable
- Propriatory to PBX manufacturer
- 'Shared' trunk lines
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