5 Reasons to Switch to VoIP | Business Phone System Guide

Five Compelling Reasons to Move Your Business to VoIP

For UK businesses still running traditional phone lines, the question of switching to VoIP comes up regularly — triggered by rising line costs, an office move, a PBX reaching end of life, or a letter from BT about the PSTN switch-off. Here are the five reasons that consistently come up in our conversations with business owners when they review their telephony.

1. Cost Savings Are Immediate and Ongoing

The cost difference between traditional landlines and VoIP is substantial. Legacy PSTN and ISDN connections carry line rental, channel charges, and call tariffs that add up quickly. A typical 10-user business on ISDN with an on-premise PBX might be spending £500–£1,000 per month on telephony. A comparable hosted VoIP system costs £80–£180 per month — a saving of 60–80%.

Even for businesses with fewer users, the savings are meaningful. Hosted VoIP plans start at around £8–£12 per user per month, which undercuts the cost of individual PSTN lines in most scenarios.

2. Your Team Can Work from Any Location

Hybrid and remote working have become permanent features of how many UK businesses operate. A VoIP phone system handles this naturally — each user can access their extension through a mobile app or desktop softphone from any location with broadband. Customers dial the same business number, and the call reaches the right person regardless of where they are working.

For businesses with multiple sites, VoIP unifies communications across locations under a single system. Internal calls between offices are free. The organisation appears to operate as a single entity regardless of physical geography.

3. Professional Features Without Enterprise Hardware

Features such as interactive voice response (IVR) menus, call queuing, call recording, and real-time analytics were previously the preserve of businesses that could justify the capital expenditure for an enterprise PBX. On a hosted VoIP platform, they are included in the monthly subscription. A business with three employees can offer callers a professional IVR menu, record conversations for compliance, and review call analytics — all without significant investment.

4. The PSTN Switch-Off Is Not Optional

BT's retirement of the UK copper telephone network means all businesses must eventually migrate from PSTN and ISDN lines to internet-based telephony. The question is when and on what terms. Businesses that migrate proactively can choose the timing, the provider, and negotiate contracts when they are not under time pressure. Businesses that wait may face a compressed transition managed by BT, potentially with less favourable terms.

The PSTN switch-off also affects secondary lines — fax, alarms, lift phones — that are easy to overlook. A proactive migration review surfaces these dependencies and allows them to be handled properly.

5. VoIP Grows With Your Business

A traditional PBX is sized at the point of purchase. Adding capacity means capital expenditure and engineer time. A hosted VoIP system scales elastically — adding or removing users through an online portal takes minutes, with no hardware changes required. This makes VoIP well suited to businesses that are growing, restructuring, or that have seasonal fluctuations in staffing.

The same scalability applies to features — call centre capability, advanced analytics, and CRM integrations can be added as the business matures, without changing platform or purchasing new equipment.

Getting Started

For most UK businesses, the practical steps to switching are: auditing existing lines and dependencies, assessing connectivity (broadband or leased line), selecting a VoIP provider, porting existing numbers, and provisioning handsets or apps. AMVIA manages this process end-to-end, ensuring existing communications remain operational throughout the migration.