Network construction firm Visionstream will integrate various wideband, wireless and dedicated digital network (DDN) technologies into Telstra's network, in a new contract worth $120 million.
For Telstra, wideband refers to its voice, data and IP services, with a transmission bandwidth of between 2Mbps to more than 10Gbps.
The contract length is three years, with an option for a two-year extension.
Visionstream, a subsidiary of Leighton Contractors, already has an existing relationship with Telstra, having worked on the telco's Wideband project for large government and business customers since 2004.
"With significant opportunities continuing to emerge in this market, the Leighton group is well positioned to continue to support the industry and the roll out of key telecommunications infrastructure throughout the nations of Australia and New Zealand," Leighton Holdings CEO Hamish Tyrwhitt said in a statement.