The equipment typically presents this data on older PBXs via a serial communications port, or more recently via a computer network over an Ethernet connection.
From the interface, CDRs are collected on computer systems running call logging and analysis software.
The goal of the call logging software is to interpret the raw CDR data and produce graphical and summarizing reports.
They also differ in the capability of logging specific types of events or data and support for specialized PBX features.
In general terms, call logging reports can highlight such areas as: During the 1970s, Post Office Telecommunications was embarking on upgrading the telephone network, with the view to modernizing the various established mechanical switching devices, consisting mostly of Strowger exchanges, employed in the UK telephone exchanges, and replacing them with an electronic system.