Following the Great Switch Off and All-IP can be difficult at times, with tons of acronyms and jargon to decode. That’s why we’ve pulled together this jargon buster guide, listing all those confusing acronyms and what they stand for.

ADSL – Asymmetric Digital Subscriber Line, ATA – Analogue Telephone Adapter, BB – Broadband, BT – British Telecom, CF – CityFibre, CLOA – Customer Letter of Authority, CNI – Critical National Infrastructure, CP – Communication Provider, CRFS – Customers Ready For Service, DDI – Direct Dial In, EU – End User, FTTC – Fibre To The Cabinet, FTTP – Fibre To The Premises, FUP – Fair Use Policy, IP-PBX – Internet Protocol private branch exchange, GSO – Great Switch Off, HVS – Hosted Voice Select, ISDN – Integrated Services Digital Network, KYC – Know Your Customer, LLU – Local Loop Unbundling, LOA – Letter of Authority, MBM – Main Billing Number, MPF – Metallic Path Facility, NTE – Network Terminating Equipment, OTT – Over The Top, PBX – Private Branch Exchange, PSTN – Public Switched Telephone Network, SIP – Session Initiation Protocol, SMPF – Shared Metallic Path Facility, SOADSL – Single Order Symmetric Digital Subscriber Line – aka SOTAP, SOGEA – Single Order Generic Ethernet Access, SOGFAST – Single Order G. Fast, SOTAP – Single Order Transitional Access Product – aka SOADSL, SVR – Site Visit Reason, VDSL – Very high-speed Digital Subscriber Line, VIP – Virtual Internet Protocol, VoIP – Voice over Internet Protocol, WLR – Wholesale Line Rental, WLR Products – WLR3 Analgoue, ISDN2, ISDN30, SMPF, SLU SMPF, Narrowband Product(s) Line Share and Classic, WLT – Working Line Takeover