PT Telekomunikasi Indonesia Tbk (Telkom Indonesia) provides telecommunications and network services. The company’s primary activities revolve around providing digital connectivity, digital platforms, and digital services. Its offerings include mobile and fixed wireless telecommunications services, leased lines, IT services, satellite, contact center, broadband access, wireline telecommunications services, pay television, and data and internet services. It also offers 5G, software-defined networking (SDN), network function virtualization (NFV), cloud, IoT, big data/artificial intelligence, cybersecurity, and services for both enterprise and consumer sectors. The company serves industries related to telecommunications, digital services, and financial services. The company markets its products under the brand names of IndiHome, LinkAja, Telkomsel Prabayar, by.U and Telkomsel Halo.

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Telkom Indonesia's R&D arm focuses on advancing network infrastructure, enhancing digital connectivity, and exploring emerging technologies. The company's efforts include projects on energy efficiency, smart city and agriculture ecosystem enhancement, smart gas well monitoring, power monitoring and IoT automation for smart data centers, and network infrastructure research. The company is also exploring infrastructure automation and virtualization, analytics tools for traffic monitoring, and emerging technologies such as LPWAN, IoT platforms, and 5G technology. Additionally, the company is investigating space telecommunications to expand infrastructure capabilities. The R&D unit of Telekom Indonesia is the Indonesia Telecommunications and Digital Research Institute (ITDRI). ITDRI focuses on technologies for Indonesia's specific market needs and collaborates with various stakeholders to conduct research and innovation activities.