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

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

LLU – Local Loop Unbundling

LOA – Letter of Authority

MBM – Main Billing Number

NTE – Network Terminating Equipment

OTT – Over The Top

PBX – Private Branch Exchange

PSTN – Public Switched Telephone Network

SIP – Session Initiation Protocol

SOADSL – Single Order Symmetric Digital Subscriber Line – aka SOTAP

SOGEA – Single Order Generic Ethernet Access

SOGFAST – Single Order G.Fast

SVR – Site Visit Reason

VDSL – Very high-speed Digital Subscriber Line

V-IP – Virtual Internet Protocol

VoIP – Voice over Internet Protocol