VoIP Phone System for Business | AMVIA Guide 2025

VoIP for Business: The Complete Picture

Business VoIP is now the dominant form of telephony for UK SMEs and mid-market companies. Driven by the PSTN switch-off and the genuine commercial advantages of hosted telephony, the transition from traditional PBX systems to cloud-based VoIP is well underway across the UK business community. This guide covers everything a business needs to understand about VoIP — from how it works to what it costs and how to choose the right provider.

How a Business VoIP Phone System Works

A business VoIP phone system — sometimes called a hosted PBX or cloud phone system — processes all calls through software running in the provider's data centre. There is no on-site PBX hardware. Calls from external phone numbers arrive at the cloud PBX, which routes them according to configured rules: to an auto-attendant, a hunt group, a specific extension, or a voicemail.

Users access the system through IP desk phones, softphone apps on their laptops, or mobile apps on their smartphones. All devices connect to the cloud PBX over the internet. Configuration — extension settings, call routing, voicemail greetings, analytics — is managed through a browser-based portal.

Key Features of a Business VoIP System

Call Management

• Auto-attendant: Answers calls professionally and routes based on caller input — essential for multi-team businesses
• Hunt groups: Distributes calls across a team to minimise missed calls
• Call recording: Records calls for compliance, training, and quality review
• Call transfer and park: Internal handling of calls between extensions
• Conference calling: Multi-party calls managed through the platform

Analytics and Reporting

• Real-time call dashboards showing current activity
• Historical reports on call volumes, answer rates, missed calls, and queue wait times
• Individual and team performance data
• Wallboard displays for contact centre environments

Mobility

• Mobile apps for iOS and Android — full VoIP functionality from a smartphone
• Desktop softphone — calls from laptop using the business number
• Same extension, same number from any location

Integrations

• CRM: Salesforce, HubSpot, Dynamics — caller screen-popping and automatic call logging
• Microsoft 365: Calendar integration, Teams integration, contact sync
• Helpdesk: Zendesk, Freshdesk — call activity linked to support tickets

VoIP Phone System Costs for Business

Hosted VoIP for UK businesses is priced per user per month:

• Entry tier: £8–£12/user/month — core calling, voicemail, basic routing
• Mid tier: £12–£18/user/month — call recording, analytics, CRM integration, mobile app
• Enterprise tier: £18–£25/user/month — contact centre, AI features, API access

Hardware (if IP desk phones are needed): £80–£200 per device. Many businesses avoid hardware cost by using softphone apps.

Choosing the Right VoIP Provider

The five leading providers for UK businesses in 2025:

• Gamma Horizon: Carrier-grade, UK-backed, £12–£18/user/month — best for managed reliability
• 3CX: Software PBX, highly configurable, from £8/user/month — best value
• Microsoft Teams Phone: Native M365 integration, £11–£21/user/month — best for Microsoft 365 users
• RingCentral: Deepest integrations, £15–£25/user/month — best for enterprise integration
• 8x8: Strong analytics and contact centre, £12–£20/user/month — best for customer service teams

Planning Your VoIP Migration

A successful VoIP migration follows a structured process:

1. Audit all existing lines and voice dependencies (including alarm and fax lines)
2. Assess current internet connectivity adequacy for VoIP
3. Select and configure the VoIP platform
4. Port existing phone numbers (5–10 working days)
5. Provision endpoints (phones, apps, or softphones)
6. Train staff and conduct go-live testing

AMVIA manages this process end-to-end for UK businesses, ensuring all dependencies are addressed and communications remain operational throughout the transition.