SINGTEL unit Optus Business's managed services contract with the Australian Taxation Office (ATO) has been extended until June 2018.
Under the contract extension, Optus will continue to deliver all voice and data communications (mobile and fixed), contact centre and videoconferencing services on behalf of the ATO.
Optus Business managing director John Paitaridis said: "The Australian Taxation Office is one of our largest and most important customers, the extension of Optus' contract demonstrates our proven ability to deliver managed ICT services to the scale, reliability and quality that the ATO and other leading Australian organisations require of their strategic partners."
The contract supports voice and data services, connecting more than 20,000 ATO end users across more than 35 locations throughout Australia using the Optus network.
"We are delivering a large scale, enterprise-wide, multi-vendor environment tightly integrated to ATO's core systems," Mr Paitaridis said.