Imagine Communications will create 300 jobs at a new customer support centre in Armagh.
Nearly 100 of the 304 people to be employed have already been recruited.
Invest NI's Ian Murphy said: "Private sector growth is crucial to Northern Ireland's future economic prosperity and this major commitment by Imagine is a positive step forward in our work to create wealth and prosperity in the local economy."
"Such a landmark investment by a high-growth Irish firm is indicative of the growing international confidence in Northern Ireland, following the recent announcement of ICICI One Source to create 1,000 jobs in Belfast and the North West," he added.
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