TETRA Ireland is an Irish company that owns and operates the National Digital Radio Service (NDRS). TETRA Ireland was appointed by the Department of Finance to build and operate the NDRS following a competitive tender process undertaken in 2006. The TETRA Ireland mission is to deliver a National Digital Radio Service that offers their customers the best mission-critical communications solution there is.

Sigma Wireless was a founding member of the TETRA Ireland consortium and the contracted entity for a Master Supply Agreement for the ongoing support of the National digital radio solution (NDRS).