Rainbow Communications has sealed a multi-year deal with the Northern Ireland Civil Service (NICS) to upgrade and maintain telephony communications networks across 185 locations.
The Northern Ireland Civil Service and associated government bodies handle and make millions of calls every year and this work will be extended across the full network.
Rainbow will transfer approximately 55,000 direct dial-in points to centralised data centres.
Established in 1998, Rainbow Communications is led by Eric Carson, a former head of both Mercury Communications and Orange in Northern Ireland, and Martin Hamill (a former Sales Manager at Mercury).
Carson said: "Delivering expertise and value were key criteria as part of the procurement process and we are delighted to now play our part in helping government to radically enhance its communication infrastructure while assisting it to achieve sustained cost savings and improved operational efficiencies for many years to come."
Philip McCauley, Head of Telecommunications for the Northern Ireland Civil Service, said: "Service delivery is the government's number one priority and this contract award will help us to ensure we can maintain that provision by introducing a quality, single infrastructure solution which not only provides stability and resilience for years to come but which reduces costs and improves flexibility and reliability."