Gamma SIP Trunks - SIP Trunking from the UK's leading provider.

Request a call and speak to a SIP Trunking specialist from Gamma today.

Brands that trust Gamma:

Metro Bank

Open University

Care UK

Knight Frank

Gamma SIP offers a more flexible and lower cost alternative to ISDN for all voice calls. Supported 24/7 with UK based dedicated SIP specialists.

Gamma SIP is the UK's most popular SIP Trunking solution - it's resilient and supported 24/7.

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.

Compatible with SIP

Integration with leading PBX Vendors

What can Gamma SIP Trunks deliver?

Number flexibility

Business-grade voice and internet convergence

Line and PBX estate rationalisation

Business continuity

Affordable resilience

Free UK calls and fraud protection

... and lot's more.

SIP Trunking from Gamma

Our SIP trunks work seamlessly with each of the leading IP PBX brands in the UK market. View the PBX vendors we work with.

Any business with a PBX can switch to our SIP trunking service and immediately benefit from a more flexible, less expensive and more resilient phone service.

PCI Compliance? We've got you covered.

We’ve partnered with Semafone to offer a flexible and cost-effective telephony solution to ensure your organisation remains compliant when taking Cardholder Not Present (CNP) payments over the phone. Combining our market leading Gamma SIP Trunks with Semafone’s award winning solution to protect your business from risk.

It’s quick to install, helps to improve agent productivity by reducing Average Handling Times and supports connections ranging from two channels to an unlimited number.

How does Gamma ensure Quality?

At Gamma we’re different. As a dynamic, independent network operator we’ve no legacy of infrastructure to protect. No fixed mind set. No hidden agenda. Just a different approach – fresh thinking and a commitment to developing innovative, disruptive products and services.

That's why ore than 98% of our customers have remained with us after the first year of service. This retention rate is one of the highest in the marketplace, thanks to our excellent customer service.