The UK’s market leading hosted phone system*


*sub 500 seats


Horizon is a cloud-based phone service that provides an extensive range of fixed and mobile telephony capabilities via an easy-to-use web portal.

It offers lots of clever business-focused features with an emphasis on control and administration through the web that takes the burden away from your customer’s IT team. Local administrators manage and configure the system according to the organisation’s needs. Employees can then manage their calls easily and effectively, thereby maximising individual productivity.

The benefits of Horizon

Horizon is delivered as a one-stop, end-to-end solution and we provide everything from handset to access to core network. This means you’ll never get caught in the middle between your voice provider and your data provider, which will save you and your customers both time and hassle.

Horizon is a true fixed / mobile converged solution

Saves your customers money and improves interoperability between mobiles and fixed telephones with extremely competitive on-net rates over a business grade network.

It’s easy to sell and encourages retention

Horizon provides you with a high-margin, very sticky service that is differentiated from other offerings through seamless-integration with a wide range of fixed and mobile features. Horizon gives your customers a service that will grow with them, save them money and add the kind of flexibility and functionality that make a real difference to productivity and image.

It’s always at the forefront of hosted IP telephony

Horizon’s ongoing development includes the addition of new features, upgrades to existing features and optional integration with third-party applications. Product development is managed by our in-house team and we actively seek input from our Channel Partners when it comes to discovering new ways to keep Horizon at the forefront of hosted IP telephony.

It offers price flexibility

Take advantage of free call termination to UK fixed destinations, including 01, 02 and 03 number ranges. This unique pricing initiative means you can offer a fixed-price solution to your customers, which helps you secure long-term deals by moving the conversation from price to the business benefits of IP telephony. If you prefer to, you can set the price your customer pays and this flexibility creates a uniquely-differentiated proposition giving you a significant edge.

It’s reliable

Horizon is a highly reliable and scalable system. We provide full support including training, number porting, provisioning and 24/7 UK-based assistance giving you complete peace of mind.

Intuitive interface

Designed and developed in-house, the Horizon web-based interface lets you implement and manage a wide range of features in real-time, giving resellers and their customers full and easy control of the entire telephony environment for improved efficiency and productivity, while minimising spend on expensive IT resources.

Rich features as standard

Including Hunt Groups, Auto-Attendants, Pick-Up Groups, Conferencing Facilities, DDI’s, Hot-desking, Remote Office, Twinning, Time of Day Schedules, Extension Dialling and Speed Dials

Extensive range of premium handsets

A choice of premium handsets from manufacturers and mobile clients for high standards of phone interoperability.

Want to know more? Get in touch today

The winning formula

Horizon combines handsets from several manufacturers, an easy-to-use web interface, Gamma’s trademark network resilience and services, and the power of the world’s leading call controller platform from Broadsoft. Horizon is available as a fully managed service.

Premium handsets plus desktop and mobile clients

choose whether you want to use soft clients, or have premium handsets for your hosted phone system

Web portal

Gamma IP network and Broadsoft call controller platform

Gamma's hosted phone system, Horizon, works on the Broadsoft platform

Horizon for Channel Partners


8 things to look for in a hosted voice provider

How to improve your customers’ communications and network resilience

Gamma is your ideal VoIP partner

Can I sell Horizon to any business?

Yes, of course! It’s a reliable, proven service, which with our jargon-free approach to telephony and only a minimal capital outlay required, makes it suitable for any size of organisation that wants to improve its productivity and image. By switching to Horizon your customers can immediately benefit from a more flexible and cheaper cost-effective phone service.

Horizon is cloud-based and accessed via a web-based portal so there are no PBX maintenance costs for your customers to worry about. It enables full integration between a customer’s fixed and mobile estates and you’re always going to win the ‘cost of ownership’ argument thanks to inclusive calls to UK 01, 02 and 03 numbers.

How difficult is it to deploy?

It couldn’t be easier for you to deploy Horizon. You simply go onto our web portal, select Horizon, then choose which access and handsets you’d like – all from one place. You can also configure Horizon via the same portal, in real-time. Within 24 hours the chosen handsets can be delivered, fully pre-configured and ready to go; it really is that simple!

Is it expensive to install?

With only a minimal capital outlay required, Horizon is suitable for any size of business looking to improve its productivity and image.

horizon - Am I able to record my calls?

Are my customers able to record their calls?

Call recording offers valuable advantages to any organisation: maximising customer service, helping with staff training, and ensuring peace of mind when it comes to due diligence.

Horizon Call Recording is a secure and compliant recording service, custom built for Horizon and embedded within the Gamma core network, offering a reliable way to record all incoming, outgoing and internal Horizon calls. With simple user-based pricing, customers can benefit from unlimited recorded calls and no upfront costs.

  • Simple and secure web portal – your customers can use advanced search, playback recordings in browser, download recordings individually or in bulk and access full audit logs and reporting
  • Multiple access policies – provide your customers with the ability to permit different actions to different user types (Global, Team, Staff or Support User)
  • Transparent and compliant – MiFID II compliant, full encryption, unlimited storage, with automatic deletion at the end of the retention period

How do we ensure call quality?

Call quality, as with any communications system, is clearly dependent on the underlying access available.

Our network was conceived and engineered specifically for business users, so with our Converged Ethernet and Broadband products delivering the service to your locations, you can be assured of great voice quality, underpinned by some of the most stringent SLAs in the business. Here are some of ways we ensure network quality for your customers:

  • Extensive monitoring of all elements and metrics within the call path both TDM and IP including but not limited to, Post Dial Delay (PDD), Answer to Seize Ratio (ASR), Network Efficiency Ratio (NER), Mean Opinion Score (MOS), Perceptual Analysis of Speech Quality (PESQ) Score, Call Closure and Error codes for C7 and SIP signalling, Jitter, Latency, Packet Loss, Trunk and Circuit occupancy, uptime and trends
  • Proactive call testing and analysis for all platforms and services
  • Appropriate and timely alerts of potential issues and ‘hot spots’ to our 24×7 Network Operations Centre
  • Review of external and internal reports including customer feedback via support desks
  • Strict change control and release management process aligned with our suppliers and carrier partners to prevent related quality or service issues
  • Oversight through a monthly quality steering group meeting chaired by our Chief Executive that includes input / output from our regular platform service reviews, capacity management, information security and business continuity forums

Have you seen our other products?

Horizon Call Centre

Horizon Call Centre is a cloud-based service with an extensive range of inbound call centre capabilities that can be configured and managed via an easy-to-use web portal.

An extension to our Horizon hosted telephony platform, this add-on service enables businesses to easily manage their call centre environments, boost productivity of call centre agents and the overall efficiency of their call centre and help them deliver a first-rate service to their customers.

Horizon Call Centre is ideal for any business that receives inbound calls; for example those with sales teams, help desks, accounts departments, receptionists or customer service representatives, right through to more formal inbound call centre environments.

Download our Horizon Call Centre datasheet

gamma sip trunking

Free Fraud Management

Gamma’s fraud management services protect you and your customers from fraudulent activity from endpoints that have fallen victim to hacking or excessive unauthorised call spends. Fraud Management is free with Horizon and our Gamma SIP Trunks and gives you:

  • Pre-set individual call limits against specific endpoints or users
  • Automatic call barring where thresholds are breached
  • Exclusive access through the Gamma Portal, under your direct control and without requiring input from Gamma
  • Peace of mind that you will not be responsible for any fraudulent over-spend above the configured threshold limit


STL Communications talk Horizon



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