What is Phone System or PABX?
PBXs or phone systems make connections among the internal telephones of a private organization — usually a business — and also connect them to the public switched telephone network(PSTN) via trunk lines Because they incorporate telephones, fax machines modems and more, the general term “extension is used to refer to any end point on the branch. PBXs are differentiated from “key systems in that user of key systems manually select their own outgoing lines, while PABXs or phone systems select the outgoing line automatically. Initially, the primary advantage of PBXs was cost savings on internal phone calls: handling the circuit switching locally reduced charges for local phone service. If you would like to see the oldest PABX it is here… Its sitting for all to view in City Ford, 85 Crown St Sydney, if you want to go take a peak! City Ford was built in 1938 and this was installed not long after! Wow, operating this manually would have been a real task!!!! Significant developments during the
