BT's Irish operations today posted revenue of £373.6m (€438.4m) for the six months to end September, a fall of 4% on H1 2009.
The company said revenues here were "impacted by challenging market conditions".
Profits (EBITDA) however increased by 14% year on year, the company said, crediting "cost management programmes and the successful delivery of large retail and wholesale contracts".
“We are making strong progress," said BT Ireland CEO Graham Sutherland.
"Revenues remain under pressure because of the challenging economic conditions, but by investing where our customers want us to invest and innovate, we are securing a healthy volume of contracts with business, government and wholesale customers.”
“We have had double digit percentage profit growth for the fourth consecutive year, driven by our relentless focus on both cost transformation and the successful delivery of our contracts with Irish and international organisations.”
Overall group revenue meanwhile fell by 3% to £4.98bn (€5.84bn), BT said.
However, underlying pre-tax profits were up 13% at £496m (€581m), beating City expectations.