ACD = Automatic Call Distribution.
BRI = Basic Rate Interface for ISDN2 circuits and connection between Systems
BLF = Busy Lamp Field shows via a LED if an extension is busy or free
CCU = Central Control Unit holds the system programming and memory
CLI = Calling Line Identity shows number of person calling you, if a speed dial is on the system with that number and Name it shows the Name.
CTI = Computer Telephony Integration enables telephone systems to talk to computers
DASS = Digital Access Signalling System digital lines from exchange
DPNSS = Digital Private Network Signalling System digital links between sites
DDI = Direct Dialling In
DECT = Digital Enhanced Cordless Technology
Hosted Voice = Cloud based voice services
IP = Internet Protocol
ISDN = Integrated Services Digital Network provided by BT etc to allow small end users to have digital connection to things like the internet.
LAN = Local Area Network
LCD = Liquid Crystal Display like the one on your telephone
LED = Light Emitting Diode see BLF
PRI = Primary Rate Interface
PSU = Power Supply Unit
PSTN = Public Switched Telephone Network
PBX = Private Branch Exchange
PABX = Private Automatic Branch Exchange
SaaS = Software as a Service – cloud based application services
IaaS = Infrastructure as a Service
PaaS = Platform as a Service
CaaS = Computer as a Service
SIP = Session Internet Protocol
SMDR = Station Message Detail Reporting used for call logging info e.g. Oak Call Loggers.
TAPI = Telephony Applications Programming Interface allows things like screen popping etc
VoIP = Voice over Internet Protocol
WAN = Wide Area Network
FTTC = Fibre To The Cabinet
EFM = Ethernet First Mile