VoIP: 25 Terms Every UK Business Owner Should Know

The telecoms world speaks its own language. PSTN, SIP, IVR, PBX… it’s like everyone agreed that perfectly sensible words needed abbreviating into alphabet soup just to confuse the rest of us.

If you’ve ever sat in a meeting with an IT consultant and felt like you needed subtitles, you’re not alone. I’ve watched plenty of business owners nod along whilst clearly having no idea what’s being discussed. Most didn’t train as telecom engineers – you just want phones that work without the headache.

Here’s your cheat sheet. Twenty-five terms you’ll actually encounter when upgrading your business phone system, explained in proper English.

Core VoIP Basics

1. VoIP (Voice over Internet Protocol) – Making phone calls over the internet instead of copper telephone lines. Think Zoom calls, but for your business phone system.
2. Cloud PBX – Your entire phone system hosted online rather than in a cupboard. Add users and manage calls from anywhere with internet access.
3. PSTN – Those old copper wire telephone lines. BT is switching them off completely by January 2027.
4. SIP (Session Initiation Protocol) – The technology that sets up and manages VoIP calls. Like air traffic control for your internet calls.
5. SIP Trunking – Connecting your phone system to the internet using SIP instead of physical phone lines. This is how modern business phone systems UK operate.

Essential Features

6. Softphone – An app that turns your laptop or mobile into a business phone. Perfect for remote workers.
7. Auto-Attendant – Your virtual receptionist. “Press 1 for Sales, Press 2 for Support.”
8. IVR (Interactive Voice Response) – Auto-attendant’s smarter cousin that can understand spoken responses and handle complex call routing.
9. Call Recording – Records conversations for training or legal protection. In the UK, you must tell people they’re being recorded. (The first time you hear your own voice played back is always… interesting.)
10. Call Forwarding – Redirects calls to another number automatically. Office phone rings on your mobile instead.

Call Management

11. Call Queue – Holds callers in line when everyone’s busy, like queuing at the post office.
12. Call Transfer – Moving a call from one person to another. Warm transfer (you announce the caller) or cold transfer (straight through).
13. Conference Calling – Multiple people on one call. VoIP phone systems make it easier and cheaper than traditional lines.
14. Hunt Groups – Routes incoming calls through a group of people until someone answers.
15. Call Analytics – Data showing who called, when, how long they waited, and which staff answered. Brilliant for spotting patterns you’d otherwise miss.

Technical Bits

16. Bandwidth – How much data your internet can handle. VoIP needs roughly 100 kbps per call.
17. Latency – The delay between speaking and the other person hearing you. Good VoIP telephone service keeps this low.
18. Jitter – Inconsistent latency causing choppy audio. Usually means your internet needs attention.
19. Codec – Compresses your voice into data for transmission. Your provider handles this, thankfully.
20. QoS (Quality of Service) – Prioritises voice calls over other internet traffic to keep calls crystal clear.

Advanced Features

21. Voicemail to Email – Voicemail messages sent to your inbox, often with transcription.
22. Presence – Shows whether colleagues are available, on a call, or away. Like Teams status indicators.
23. DID Numbers – Unique phone numbers that ring specific people or departments directly, without going through reception.
24. Number Porting – Transferring your existing phone numbers to a new VoIP telephone service. Takes 10-15 working days.
25. Unified Communications – Integrating phone calls with email, messaging, video, and collaboration tools. Your Cloud PBX talks to Microsoft Teams, your CRM, and everything else.

Why This Actually Matters

Understanding these terms isn’t about becoming a telecoms expert. It’s about making informed decisions when upgrading your business phone system.

The PSTN switch-off in the UK means millions of businesses need new phone systems. Knowing what you’re buying could save you thousands. Plus, when the IT consultant starts throwing acronyms around, you’ll know whether they’re being helpful or just trying to sound clever.

Let’s Talk Phones

Look, we get it. Learning telecoms terminology isn’t exactly thrilling. You’ve got an actual business to run.

But with the PSTN deadline approaching and VoIP becoming standard, understanding the basics helps you choose the right system for your needs – not just whatever the salesperson’s pushing this month.

At PineVox, we’ve spent over 20 years helping UK businesses navigate phone system upgrades without the jargon overload. We explain things clearly, set you up properly, and stick around when you need support.

Ready to upgrade your business phone system?

Get in touch with PineVox today and let’s have a proper chat about what your business actually needs.