Telstra is Australia's largest telecommunications group, with material market shares in voice, mobile, data and internet, spanning retail, corporate and wholesale segments. Its fixed-line copper network will gradually be wound down as the government-owned National Broadband Network rolls out to all Australian households, but the group will be compensated accordingly. Investments into network applications and services, media, technology and overseas are being made to replace the expected lost fixed-line earnings longer term, while continuing cost-cuts are also critical.