Which VoIP provider has the best features overall?

RingCentral has the broadest feature set and largest integration library in this comparison. 3CX offers comparable telephony features at a lower price point. The 'best' feature set depends on which features your business needs — paying for an extensive feature library you will not use adds unnecessary cost.

Is Microsoft Teams Phone as reliable as dedicated VoIP platforms?

Microsoft publishes a 99.9% uptime SLA for Teams, which is slightly below the 99.999% offered by 8x8 and RingCentral. In practice, Microsoft's infrastructure is highly reliable. The 99.9% SLA represents up to 8.7 hours of permitted downtime per year — which is adequate for most business requirements. Microsoft Teams Phone has surpassed 26 million PSTN users worldwide as of December 2025 — up from 20 million in April 2024, representing 30% growth in 20 months. (UC Today)

Can I get call recording with any of these providers?

Yes, though the availability varies by plan tier. 8x8 X2, Gamma Horizon (mid-tier), and 3CX Professional all include call recording as standard. RingCentral requires the Advanced or Ultra plan for call recording. Teams Phone requires either Teams Premium (paid add-on) or a third-party compliance recording partner.

Which provider is best for a business with remote workers?

All five providers support remote working through mobile apps and desktop softphones. Teams Phone is particularly strong for Microsoft 365-centric remote workers who already use Teams for collaboration. Gamma Horizon's mobile app and 3CX's web client and mobile apps are both well-regarded for remote use scenarios.

Do these VoIP providers support number porting?

Yes, all five support UK number porting — transferring your existing 01, 02, 03, and 0800 numbers to the new platform. Porting typically takes 5–10 working days. Some providers charge a one-off porting fee per number (typically £5–£15); others include porting in the setup costs.

How does 3CX pricing work compared to per-user pricing?

3CX is priced by simultaneous calls (concurrent call capacity) rather than strictly per user. This means a business with 30 users but typically only 8 concurrent calls pays for 8 simultaneous call capacity rather than 30 users — which can be more cost-effective. The hosted price is approximately £8–£14 per user per month when calculated based on user count.

VoIP

VoIP Provider Comparison | Top UK Systems Compared

An updated VoIP provider comparison for UK businesses in 2025: Gamma Horizon, 3CX, RingCentral, Microsoft Teams Phone, and 8x8 compared side-by-side on pricing, features, uptime SLA, support, and best-fit profile. Pricing ranges from £8 to £25 per user per month.

MC

Matt Cannon

Managing Director

9 min read·Mar 2026

A Current VoIP Provider Comparison for UK Businesses

The VoIP market evolves continuously — pricing changes, features are added, and new providers enter the market. This updated comparison reflects the current state of the UK market, focusing on the five providers most frequently shortlisted by UK SMEs and mid-market businesses.

Pricing Comparison

3CX: From £8/user/month (hosted, annual) — lowest entry point in this comparison
Gamma Horizon: £12–£18/user/month — mid-market carrier-grade hosted PBX
Microsoft Teams Phone: £11–£21/user/month (licence + calling plan) — competitive for M365 users
8x8 X2: £12–£15/user/month — competitive UCaaS entry
RingCentral Core: £15–£18/user/month — higher-end UCaaS

Feature Comparison

Core Telephony Features (All Providers)

All five providers include: auto-attendant, hunt groups, voicemail to email, call transfer, call hold/park, and mobile apps.

Call Recording

3CX: Included on Professional tier
Gamma Horizon: Included on mid-tier plans
Teams Phone: Available via Microsoft Teams Premium add-on or Compliance Recording partners
8x8: Included on X2 and above
RingCentral: Included on Advanced and Ultra plans

CRM Integration

3CX: Salesforce, HubSpot, Dynamics, Zoho, and others (native integrations)
Gamma Horizon: Limited native CRM; Teams integration available as add-on
Teams Phone: Native deep integration with all M365 apps; Salesforce and HubSpot via connectors
8x8: Salesforce, HubSpot, Zendesk, ServiceNow (X4 and above)
RingCentral: 250+ integrations — widest integration library in market

Analytics

3CX: Standard call reports; wallboard available
Gamma Horizon: Detailed analytics on Professional tier
Teams Phone: Call quality analytics via Teams Admin Centre; Power BI for advanced reporting
8x8: Advanced analytics with supervisor dashboards on X4
RingCentral: Comprehensive analytics suite on Advanced and Ultra plans

Uptime SLA Comparison

Gamma Horizon: 99.99%
3CX: Dependent on hosting provider (typically 99.9%+)
Teams Phone: 99.9% (Microsoft)
8x8: 99.999%
RingCentral: 99.999%

Support Comparison

Gamma Horizon: Via accredited reseller; UK-based account management
3CX: Via reseller or direct (higher tiers); community forums
Teams Phone: Via Microsoft or Microsoft partner
8x8: 24/7 support via phone, email, chat; UK coverage
RingCentral: 24/7 support; UK account management on mid-market and above

Best-Fit Summary

Best value: 3CX
Best UK reliability: Gamma Horizon
Best for M365 users: Teams Phone
Best integrations: RingCentral
Best analytics/contact centre: 8x8

AMVIA provides current pricing for all five platforms and can configure a side-by-side comparison based on your specific user count, feature requirements, and budget.

Which VoIP Provider Wins for Your Business?

AMVIA maps these five providers against your specific requirements and gives you a clear, current comparison with no commercial bias.

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