SIP Trunks

A SIP Trunks Solution, such as the one provided by Gamma, is the natural replacement for classic ISDN services. A Gamma SIP Trunks will connect your site directly to the Gamma networking, using an IP connection to transport your inbound and outbound calls.

Through connecting your PBX to Gamma's network, you enable full PSTN breakout and the connection via an IP provides an secure end-to-end service. UTL Telecoms Solutions are an experienced Gamma partner, with the knowledge and expertise to provide your business with a bespoke implementation that will meet your business needs whilst keeping costs to a minimum.

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 centre's.


Flexibility of Phone Numbers

SIP trunking enables you to move office and keep the same geographic number without any ongoing call-forwarding costs or those associated with producing new company stationery.

Business Continuity

If your office has to be temporarily relocated in an emergency, this can be achieved quickly and cost-effectively with SIP trunking to keep your business working.

Line Rationalisation

For businesses with multiple sites, SIP trunking provides the opportunity for line rationalisation and reduces the number of PBXs you need to maintain, whilst retaining full control of the numbers associated with your business.

Save money

IP Connectivity costs less than ISDN with lower call costs, free internal calls between extensions and offices and lower line rental costs for multi-sites. Also, no expensive call forwarding costs also required should you relocate or need to divert calls in the event of a disaster.


SIP trunking provides a phone service that will cope with any situation and give you business-grade resilience for your telephony. Whether you need to keep your business running in a disaster or emergency or you need to load balance your calls between sites during peak hours, SIP trunking delivers.

Compatible with Skype for Business

Gamma SIP Trunks are integration tested and approved to inter operate with Skype for Business, allowing you to directly connect the platform to make external calls.


  • Lower Costs
  • Enables line and PBX estate rationalisation
  • Offers number flexibility
  • Business-grade voice and internet convergence
  • Business continuity comes as a standard
  • Offers affordable resilience
  • Free UK Calls and fraud protection
  • Extremely reliable