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Unlocking the secrets of tech talk: The PSTN Switch Off

Updated: Oct 10, 2023

Navigating the world of telecommunications can be like deciphering a secret code. With a maze of technical terms and acronyms like PBX, FTTC, and LLU, it's easy to get lost. But fear not! We're here to simplify the complex and make it easy for you to grasp these tech terms.

Introducing the Jargon Buster

A "Jargon Buster" is your trusty tool for unraveling the mysteries of technical language. It's like a language decoder, providing clear explanations of complex terms, turning them into everyday language. Think of it as your secret weapon for understanding tech talk.

The world of telecommunications is evolving rapidly, and staying informed is crucial. We've gathered essential tech jargon in this super guide to keep you in the loop:

Firstly, let’s tackle the PSTN Switch Off.

The PSTN Switch Off

The Public Switched Telephone Network (PSTN) has been around since the 1800s, but it's time for an upgrade. Openreach, a subsidiary of BT, is transitioning to a full-fiber network, phasing out PSTN by December 2025. This impacts Wholesale Line Rental (WLR) products. The "Stop Sell" phase is already underway in many areas, so check if your local exchange is affected.

All IP (Internet Protocol)

All IP is the language of the future. It's what connects broadband-connected devices, providing faster connections and advanced features. It's cost-effective, charging a monthly fee instead of per-minute rates. Plus, it's perfect for remote or hybrid work setups.

Stop Sell and End of Life

Sounds pretty final, right? Stop Sell has now been completed throughout the UK, and all WLR products have moved to End of Life.

By the end of December 2025, the PSTN as we know it will cease to exist. All businesses should move to an All IP solution before this date.

FTTC (Fibre to the Cabinet) and FTTP (Fibre to the Premises)

FTTC connects through a mix of fibre optics and copper wires, often resulting in slower speeds due to shared connections. FTTP, on the other hand, is full-fibre, offering dedicated fibre optic cable connections for blazing fast speeds.

SoGEA (Single Order Generic Ethernet Access)

SoGEA is broadband without the landline. It eliminates line rental costs and simplifies billing. You'll need a Voice over Internet Protocol (VoIP) service for calls.

PBX (Private Branch Exchange)

A PBX is your business's phone exchange system, but it can be costly and limited to on-site use. It's getting replaced by more flexible and cost-effective All IP solutions.

Hosted Telephony

Hosted telephony is cloud-based, making it easier to manage and scale. You only need handsets, and you can make calls using a data connection. Perfect for agile working.

SIP (Session Initiation Protocol) Trunking

SIP is replacing ISDN for voice traffic. It connects voice calls via broadband, ethernet, or private circuits, offering cost savings and flexibility.


Many of you will be familiar with the term ‘ethernet’ and will think of the cables that you use at work or at home to connect devices to a network. In data terms however, the proposition is slightly different. Ethernet guarantees reliable and fast internet connections for businesses. It comes with service level agreements and is perfect for businesses with high connectivity demands.

VoIP (Voice over Internet Protocol)

VoIP uses the internet for calls, eliminating the need for a landline. It's flexible, works remotely, and offers cost savings.

Unified Communications (UC)

UC integrates various communication platforms, like email, chat, and voice, into a unified user interface for seamless, convenient communication.

With this jargon buster by your side, you're better equipped to navigate the ever-changing world of telecommunications. Say goodbye to confusion and hello to clarity in tech talk!

If you’re still not sure about the benefits of VoIP or would like more information, our team of experts would love to hear from you- 020 4599 1365.

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