Lines, Calls, Broadband & Ethernet.

Our voice, data and mobile products are perfect for any organisation - from SME to Enterprise, Medical Centre to School. And we provide it all in-house with a dedicated billing team to look after you properly.

From cost-saving line rental and calls through to IP cloud hosted phone systems, superfast business grade fibre broadband and enterprise Ethernet. All of this is geared to save you money while your business works faster and more flexibly than ever before.

Why Choose Check? We're experts in voice products. Provide low cost packages. Offer you a dedicated billing manager. Partner with Gamma & BT to offer you the ultimate service.
Lines, Calls, Broadband & Ethernet. 'Connectivity' covers a wide array of products, from Analogue line rental to full enterprise grade Ethernet. As a leading provider of comms infrastructure we can provide the services nessesary to keep your business connected to your customers and each other, keeping you moving effectively in the right direction.

SIP Trunks

SIP is the new phone line standard. By 2025 ISDN will be completely phased out in the UK and SIP will have replace it. SIP Trunks have revolutionised phone lines and therefore systems, allowing amazing flexibility, huge rental and call cost reductions and built in disaster recovery.

What is SIP Trunking? SIP Trunking is our standards based replacement for traditional ISDN. It connects your PBX to the PSTN via broadband, Ethernet or private circuit into our national network. Our SIP Trunks work seamlessly with each of the leading IP PBX brands in the UK market.

SIP Compatible Systems
The benefits of Gamma SIP Trunks Compared to ISDN our SIP trunking service is less costly per channel and more flexible in how and where geographic telephone numbers can be used. It’s also quicker to install and provision and, as standard, it delivers extremely robust business continuity.

The service can support connections ranging from two channels for small PBX-equipped businesses to an unlimited number of channels for large enterprises and contact centres.

Save money on call costs and line rental

SIP delivers less costly, more reliable connectivity than ISDN over an IP connection. It can save up to 50% on line rentals and 25% or more on call costs.

Free internal calls and great features

Perfect for medium or large organisations with multiple sites, not only will you save on your line rental and call costs, but you'll get free internal calls within your organisation and a whole host of great features.

Scale up and down when you want

SIP trunks are ideal if you are moving, upsizing or downsizing and want to keep your existing numbers. Scale up lines during busy periods and back down again afterwards. You can add lines, take them away, split calls at any time. You are always in control.

Built-in Business Continuity

SIP trunks can handle emergencies easily. They are inherently disaster recovery / business continuity ready, letting you reroute calls to an alternative location quickly and easily.

Can I have SIP Trunking in my business? Any business with a SIP capable PBX, such as the Mitel MiVoice solution can switch to our SIP trunking service and immediately benefit from a more flexible, less expensive and more resilient phone service. Cloud phone systems like our MiCloud and Horizon use SIP trunking but in a slightly different way, visit our Cloud & Hosted section for more info.

You might also find that compared to ISDN line rental and call costs, you can actually swap out your current ISDN PBX and upgrade to SIP, buy a brand new Mitel and STILL pay less than you're currently doing just for your monthly rentals!

Cloud & Hosted

ISDN, Analogue, Calls & Lines

Cost savings, made easy.

It’s easy to save money on your business phone costs. Simply make the hassle-free switch to Check and start saving immediately by making all your calls, at significantly lower cost, through the award winning Gamma network - one of the largest in the UK.

Make life less complicated by combining our phone services with line rental, call minutes and other related facilities. And to make it easier for you to see how much you really are saving you’ll get everything on one bill, from one provider. Combined with your telephone system maintenance, this is the very best solution.

About the Gamma network

Check together with Gamma is one of the UK's biggest providers of voice services and voice applications and our Next Generation IP network is one of the largest voice networks in the UK. Because we’re business only we can focus on giving our customers the most reliable business grade services coupled to the most responsive customer service.

Our national network interconnects with all the other major providers - among them BT, Cable & Wireless, Virgin Media, Talk Talk, EE, T-Systems, enabling us to provide the very best service at the very best price.
Gamma Logo Small

Business Broadband

With more and more applications moving from customer premises and into the cloud, it's essential you can connect your business and workforce reliably and at high speeds. Our full range of Broadband services includes Fibre Broadband using Fibre to the Cabinet (FTTC), Converged Broadband and Assured Broadband dedicated to our voice services.

Our Broadband is designed exclusively for the business market – offices and homeworkers. Our network has been built to provide high-quality products and services and this is supported by a highly-skilled group of UK-based support staff and engineers. Our unique Assured services are designed for IP telephony, whether it's for Gamma SIP Trunks or our Horizon hosted voice service.

Fibre Broadband

With speeds up to 80Mbps downstream and up to 20Mbps upstream, we offer a widely-available set of Fibre products with the following options:

  • Business Care - 22 hour fix time SLA*
  • Expedite the installation time for new circuits
  • Regrade to different Broadband products
  • Additional IP addresses (standard is one free static IP)

Assured Broadband

A specialist Broadband product designed to support our IP telephony services, Assured provides all the elements of the end-to-end IP telephony solution and offers the the following options:

  • Up to 15 concurrent G.729 calls
  • Provision of a quality Cisco router with no upfront costs for longer term contracts
  • Additional IP addresses (standard is one free static IP)

Converged Broadband

Combining Gamma Assured Broadband and internet access using just one circuit, Converged Broadband is underpinned by a stringent SLA and offers the following options:

  • Fibre or ADSL2 Broadband (location dependent)
  • Provision of a quality Cisco router with no upfront costs for longer term contracts
  • Additional IP addresses (standard is one free static IP)


As more services move into the cloud, so the need for fast, secure and reliable internet connectivity has become essential. Gamma’s Ethernet products provide highly reliable, secure and fast data connectivity.

Fibre ethernet

Whether you are using our Ethernet service to connect home or office workers to the internet or our voice platforms, we provide you with high quality, scalable, managed services. The combination of our network, our IP telephony products and our UK-based support team puts you in control of the connectivity needs of your business.

Ethernet services can help reduce the cost of private networking while improving the quality of service and support. We offer scalability and flexibility unavailable from legacy services. And we deliver dedicated, secure, uncontended business-class connections for all your voice and data traffic.

Gamma Fibre Ethernet is ideal for organisations that wish to converge voice and data on a single connection. And by using Gamma you’ll benefit from significant cost savings while enjoying the ease of dealing with a single, accountable supplier.

We support our Fibre Ethernet product with robust, end-to-end SLAs that include 24/7 UK-based support.

Gamma Ethernet image

What services are available?

FTTC Ethernet

With dedicated symmetrical bandwidth speeds up to 80Mbps both downstream and upstream, we offer a widely-available set of entry-level FTTC Ethernet products with the following benefits:

  • Fast, reliable access at a more affordable price and includes all Ethernet features
  • Rental costs and installation leads times significantly lower than Fibre Ethernet and EFM services
  • Reliable service with 8 clock-hour fix Service Level Agreement (SLA)
  • 24/7 monitoring with UK-based helpdesk

EFM (Ethernet in the First Mile)

Our EFM service is a converged internet and voice solution with dedicated and symmetrical bandwidth speeds of up to 100Mbps:

  • Committed and upgradeable bandwidth speeds
  • Delivered in half the time of Fibre Ethernet
  • No compromise on quality or service levels
  • Inherently resilient and reliable service with 8 clock-hour fix SLA
  • 24/7 monitoring with full helpdesk support

Fibre Ethernet

We offer a full range of Fibre Ethernet services with speeds of up to 1Gbps providing dedicated, secure, uncontended business-class connections for all your voice and data traffic. Ideal for organisations wishing to converge voice and data on a single connection:

  • Highly-reliable, secure and fast data connectivity
  • Helps reduce the cost of private networking while improving the quality of service support
  • Scalability and flexibility that you can't get from legacy services
  • Robust, end-to-end SLAs that include 24/7 UK-based support with 6 clock hour fix time SLA
  • A single, accountable supplier

Related Products

MiVoice Office 250

The ideal solution for SME's, Schools & Medical Centres. READ MORE

MiVoice Business

Our Enterprise platform, provides Unified Comunications and easy expansion. READ MORE

MiCloud Office

More than just a phone system, MiCloud Office has the power to transform your business. Born in the cloud and designed for today’s mobile workforce, it delivers a clear business impact that elevates the conversation with colleagues and customers. READ MORE

Get in touch!

Call us on

01244 834800

or fill in the form below and we'll get back to you soon.


Clear Form Send

This site uses cookies to store information on your computer. See our Cookie Policy for further details on how to block cookies.
I am happy with this


What is a Cookie

A cookie, also known as an HTTP cookie, web cookie, or browser cookie, is a piece of data stored by a website within a browser, and then subsequently sent back to the same website by the browser. Cookies were designed to be a reliable mechanism for websites to remember things that a browser had done there in the past, which can include having clicked particular buttons, logging in, or having read pages on that site months or years ago.

NOTE : It does not know who you are or look at any of your personal files on your computer.

Why we use them

When we provide services, we want to make them easy, useful and reliable. Where services are delivered on the internet, this sometimes involves placing small amounts of information on your device, for example, your computer or mobile phone. These include small files known as cookies. They cannot be used to identify you personally.

These pieces of information are used to improve services for you through, for example:

  • recognising that you may already have given a username and password so you don’t need to do it for every web page requested
  • measuring how many people are using services, so they can be made easier to use and there’s enough capacity to ensure they are fast
  • analysing anonymised data to help us understand how people interact with our website so we can make them better

You can manage these small files and learn more about them from the article, Internet Browser cookies- what they are and how to manage them

Learn how to remove cookies set on your device

There are two types of cookie you may encounter when using our site :

First party cookies

These are our own cookies, controlled by us and used to provide information about usage of our site.

We use cookies in several places – we’ve listed each of them below with more details about why we use them and how long they will last.

Third party cookies

These are cookies found in other companies’ internet tools which we are using to enhance our site, for example Facebook or Twitter have their own cookies, which are controlled by them.

We do not control the dissemination of these cookies. You should check the third party websites for more information about these.

Log files

Log files allow us to record visitors’ use of the site. The CMS puts together log file information from all our visitors, which we use to make improvements to the layout of the site and to the information in it, based on the way that visitors move around it. Log files do not contain any personal information about you. If you receive the HTML-formatted version of a newsletter, your opening of the newsletter email is notified to us and saved. Your clicks on links in the newsletter are also saved. These and the open statistics are used in aggregate form to give us an indication of the popularity of the content and to help us make decisions about future content and formatting.