Skype for Business and Gamma SIP Trunks
For enterprise voice integration
Extending unified communications
beyond the office environment

Become a Gamma SIP Trunk & Skype for Business Partner

Enterprise voice is becoming an integral part of the Skype for Business (previously Microsoft Lync) proposition. Whilst it’s widely acknowledged that SIP is going to replace all other terrestrial voice protocols, the reality is that in a unified communications environment such as Skype for Business, this transition from legacy to VoIP is happening more rapidly than in any other.

Now is the time to leverage this opportunity - why sell just Microsoft licensing when you can offer your customers an extended robust telephony service through SIP trunking, while making more money and more margin?

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The Skype for Business SIP opportunity

Partners who are already providing customers with Skype for Business professional services and support can benefit from a 50% increase in margin*.

*Source - MS Lync System Integrator Price Book ($175 per user professional services, $84 per annum support services). Margin and revenue opportunity is based on the average rate Gamma Channel Partners charge for SIP channels.


As a certified Skype for Business partner and a member of the Microsoft Unified Communications Open Interoperability Program, we can support Skype for Business implementations, giving your customers access to one of the UK’s leading SIP providers. There is no requirement for additional hardware, such as an on-premise SBC. We can also offer full support for native Skype for Business SIP trunks direct onto the Gamma network and provide useful configuration guides to help with implementation.

Don’t want the expense or hassle of running your own billing platform? We can do it for you

Our branded billing bureau option can take away the operational burdens, making our service even easier for you to deliver to customers. We can bill your customers transparently, using your brand, which gives you complete ownership over your customer base without the expense or hassle of purchasing and running a billing platform.

What makes Gamma different?

  • We own and operate the entirety of our SIP network, removing the middle man.
  • We’ve been providing SIP trunking services via our core network since 2006.
  • We’re one of the UK’s largest SIP trunk providers, with over 350,000 supported channels.
  • We’re one of the UK’s largest network carriers of fixed-line voice minutes.
  • We switch over half of our voice traffic in IP minutes..
  • We support over 300 UK partners with SIP, providing a range of resilient options.
  • We provide ISDN line rationalisation to reduce maintenance, whilst giving customers full control of their numbers.
  • A constantly monitored SIP network, resilient options for your customers and a suite of advanced monitoring and diagnostic tools ensures that any issues with the network can be quickly identified and resolved.
  • Your customers can benefit from a high-quality voice and data service from just one connection with Gamma SIP Trunks delivered over Gamma Broadband or Gamma Ethernet.


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Skype for Business with Gamma SIP Trunks

Improve collaboration, boost productivity and reduce cost with Skype for Business and Gamma SIP Trunks

Connections have never been more important – whether it’s connecting with customers, partners, vendors or employees, access to a reliable, quick and clear connection anywhere, anytime is vital.

Skype for Business is an easy-to-use, feature-rich communications tool that gives organisations access to voice, IM, audio, video and web conferencing, all via a single solution. Through a clever yet simple integration, Gamma SIP Trunks can extend unified communications beyond the office environment by connecting Skype for Business to the public network.

Our SIP trunking solution is qualified by Microsoft to interoperate with Skype for Business, providing a seamless experience and making it an ideal solution for any organisation that is looking at implementing Skype for Business or that already uses it.

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Combining the functionality of Skype for Business with the cost-savings and business-grade resilience of Gamma SIP trunking solutions offers lots of benefits:

  • Cost savings – SIP connectivity costs less than ISDN with lower call costs, free internal calls between extensions and offices and lower line rental costs for multi-sites. There are no expensive call-forwarding costs should an organisation need to relocate or divert calls in the event of a disaster. Also, access to video conferencing means less travel expenses.
  • Increased resilience – whether the key concern is keep a business running in an emergency or load balancing calls between sites during peak hours, calls can be easily and quickly rerouted.
  • Removing geographic barriers – extend communication over IP and stay connected with any location, at anytime. Video conferencing keeps people connected from anywhere, reducing the need for face-to-face meetings.
  • Improving collaboration – communicate more effectively, collaborate on the fly, easily ask questions and get answers quickly.
  • Boosting productivity – status indicators show whether someone is available, busy, away or offline, which helps reduce time wasted by chasing contacts when they’re unavailable.
  • Improving customer service – quicker response times and offering multiple ways to communicate means a business can be there for its customers in the way that helps them most.
  • Reducing carbon footprint – as well as cost and time savings, hosting virtual meetings will help reduce the carbon footprint.


We offer a range of added value features with our SIP trunking solutions including:

Skype for Business - Gamma SIP Trunks are integration tested and approved to interoperate with Skype for Business

Number flexibility to ensure a smooth transition to SIP trunking without losing telephone numbers

Fraud management to provide protection from telecoms fraud

Free internal calls - not only will you save on your line rental and call costs, but you'll get free internal calls within your organisation (including international)

Free call termination to UK fixed destinations, including 01, 02 and 03 number ranges

Disaster recovery / business continuity-ready - handle emergencies easily by rerouting calls to an alternative location quickly

Gamma SIP Trunks and Skype for Business - How it works

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Why Gamma SIP Trunks?

Gamma SIP Trunks connect organisations with our nationwide network, provide access to the public phone network and offer a more flexible and lower-cost alternative to ISDN for inbound and outbound voice calls.

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 decline of ISDN

The market is transitioning from ISDN to SIP at an accelerated pace. Since 2008 around one million ISDN channels have 'disappeared', with SIP proving the major benefactor. According to Illume*, research conducted during the last six months of 2013 found that almost 200,000 SIP trunks were added – taking UK SIP trunks past the one million trunk mark for the first time.

ISDN channel decline is around 300,000 year-on-year** and if the current trend continues, the number of ISDN channels will fall below one million before the end of the decade.

As the uptake of SIP trunking grows, so too does the number of providers to choose from. However, very few, if any, have the expertise and network capability of Gamma.

ISDN channnels used by businesses

*Illume Research – UK IP/SIP Trunking Market Report & Forecast – January 2014-2018

**Source: Ofcom, The Communications Market 2013


Gamma SIP Trunks v ISDN

Buy from a Microsoft Partner

Choose from one of our Skype for Business and Gamma SIP specialist reseller partners below.

0844 561 1577

6 West Mills Yard
Kennet Road
West Berkshire
RG14 5LP

0870 15 25 750

Cisilion House
Guildford Road
KT22 9UT

01252 779000

Dimension Data House
Building 2, Waterfront Business Park
Fleet Road, Fleet
GU51 3QT

020 77991525

Capita plc
71 Victoria Street

0845 680 0077

Risual House,
Parker Ct,
Staffordshire Technology Park,
ST18 0WP

01403 788 114
Email Sonus

Edison House, Edison Road
Dorcan, Swindon,

0161 955 4391
Email Novosco

Novosco Ltd
Adamson House
Towers Business Park
Didsbury, Manchester
M20 2YY

020 7075 1400
Email G3 Comms

G3 Comms Pentagon House,
2nd Floor
52-54 Southwark Street


About Us

Switching in excess of 650 million minutes a month and serving over 700 Channel Partners, Gamma is one of the largest network carriers of fixed-line voice minutes in the UK and is the carrier of choice for many organisations, providing a comprehensive range of next generation voice, data and mobile services to businesses, the public sector and not-for-profit organisations. Our products include fixed telephony, IP telephony, hosted phone systems, broadband and data connections, mobile services, security and unified communications solutions.

With over 200,000 supported channels, we’re one of the UK’s leading providers of SIP, one of the fastest-growing service in today’s telephony market. Gamma SIP Trunks works by connecting your site directly into the Gamma network via an IP connection to carry and terminate your inbound and outbound voice calls across the public telephone network.

Gamma SIP Trunks provides flexible, cost-effective voice services that can tie into the most popular unified communications tools on the market, Microsoft Lync.


Contact Us

To find out more call us on 0333 014 7999 today or complete the form below.