Gamma Horizon is the UK's most widely deployed hosted VoIP platform — a fully managed cloud phone system with 99.999% uptime SLA, Microsoft Teams integration, and zero on-site hardware. T2K VoIP has been deploying Horizon for UK businesses since 2008, with 15+ years proven track record.
Gamma Horizon dominates the UK business VoIP market for good reason — it's reliable, scalable, and managed entirely in the cloud with no on-site hardware to maintain.
Horizon isn't just a hosted phone system — it's a unified communications platform with features designed for how UK businesses actually work.
Watch our short overview to see why thousands of UK businesses trust Gamma Horizon for their daily communications and how easy it is to manage.
Horizon is 100% hosted cloud — there are no on-premise deployment options. You choose handsets, configure users via web portal, and plug phones into your network. Gamma handles everything else.
Choose the perfect Gamma Horizon package for your team. All tiers include premium UK-based support, inclusive call bundles, and a choice of free hardware on a 36-month term.
| Features |
Horizon Essential
£12.95
per user / month
|
Horizon Office
£16.95
per user / month
|
Horizon Enterprise
£24.95
per user / month
|
|---|---|---|---|
| Core & Hardware Features | |||
| Apps for PC, Mac & Smartphone | ✓ | ✓ | ✓ |
| Unlimited UK Local, National & Mobile Calls* | ✓ | ✓ | ✓ |
| Included Handset (Yealink T73W or W73P)* | ✓ | ✓ | ✓ |
| Admin & User Management Portal | ✓ | ✓ | ✓ |
| Premium UK-based Technical Support | ✓ | ✓ | ✓ |
| Call Routing & Handling | |||
| Auto-attendant (IVR) & Hunt Groups | ✓ | ✓ | ✓ |
| Scheduled Out of Hours & Bank Holiday Routing | ✓ | ✓ | ✓ |
| Call Forwarding, Pickup Groups & Conference Calling | ✓ | ✓ | ✓ |
| Voicemail to E-Mail & Music on Hold | ✓ | ✓ | ✓ |
| Configurable Call Barring & Nuisance Blocking | ✓ | ✓ | ✓ |
| Integrated Telephone Directory | ✓ | ✓ | ✓ |
| Advanced Call Management | |||
| Basic Call Logging | ✓ | ✓ | ✓ |
| Call Queueing | — | ✓ | ✓ |
| Call Recording (3 Month Retention) | — | ✓ | ✓ |
| Horizon Call Centre Agent | — | — | ✓ |
| Get Started → | Get Started → | Get Started → |
Horizon integrates with the platforms UK businesses already use — from Microsoft Teams to CRM systems and contact centre software.
Horizon works best for specific types of UK business. Here's who gets the most value from the platform.
| Feature | Gamma Horizon | Typical Alternative (e.g. 3CX, Mitel) |
|---|---|---|
| Deployment Model | 100% hosted cloud only | Cloud, on-premise, or hybrid |
| Hardware Requirements | Zero on-site servers or PBX | May require on-site PBX or servers |
| Uptime SLA | 99.999% guaranteed by Gamma | Varies (often lower or no SLA) |
| CRM Integration Depth | Basic (CTI pop, click-to-dial) | Deep native integration (e.g. 3CX) |
| Configuration Flexibility | Moderate (Gamma's constraints) | High (full control with on-prem) |
| Ideal Customer | 5–200 user SMEs wanting simplicity | Varies by platform (enterprise, SME, specific verticals) |
Questions we regularly hear from UK businesses evaluating Gamma Horizon.
Gamma Horizon isn't right for every business. Here are alternative platforms T2K deploys when Horizon doesn't fit.
Talk to T2K VoIP about Gamma Horizon for your UK business. We've been deploying Horizon since 2008 with 15+ years proven track record. Free consultation, transparent pricing, honest advice.
Your trusted technology partner.
