- To research, production and assembling of telecom, post, electricity, informatics and electronic equipments.

- To provide Technical consultancy, make investment plans, design and appraise projects.

- To Import and export equipments, materials, and accessories components.

- To lease assets and equipments.

- Others under business license.

- 1990: Formerly known as Kasati Hanoi Center, is a unit attached to State Enterprise, Enterprise of manufacturing information equipment.

- March 10, 2000: Transformed into Telecommunication Technical Service Joint Stock Company (TST) under the Decision No.232/2000/QD-TCCB with an initial charter capital of VND7 billion.

- 2007: Increased charter capital to VND48 billion.

- December 03, 2007: Listed on Hanoi Stock Exchange (HNX).

- December 13, 2007: Officially traded on Hanoi Stock Exchange (HNX).