Telephone Networks
Least cost routing means that the PBX can decide the least expensive route to place a long distance call (choice between a leased trunk line, different common carriers or dial-up)
Digital PBX is used for speed and reliability. In order to use one, voice has to be digitized to go through the switch.
Digital PBXs have three major characteristics:
- Hierarchical or distributed architecture:
- Hierarchical systems distribute routine functions to the switching module, but real control resides in the central processor
- In a fully distributed system, each switch module processes its calls independent of any other components (increased reliability, load problems)