Call logging is the process of gathering, examination, and reporting technical and statistical data regarding phone calls. It excludes call recording and phone tapping. Data from a telecommunications system or private branch exchange (PBX) is gathered in the form of call detail records, which include the originating station, destination, start and end times, and transmission parameters (CDRs). The data is often presented via a serial communications port on earlier PBXs, or, more recently, via a computer network over an Ethernet connection on more current PBXs. CDRs are gathered on computer systems that run call logging and analysis applications via the interface. Although some PBX vendors supply simple call tracking software, there are many additional third-party options.