1933
Tunesia is assigned to the Central Office of Technical Bureaus

1951
The company is represented by Sitelec S.A.

1966
Order from the Tunisian post and telecommunications authority for laying and assembling communication cables

A Resident Engineer is sent to Tunisia

1975
Peter von Siemens visits Tunisia during a trip to Africa; talks and negotiations with government representatives

Order from the Société Nationale des Transports (S.N.T.) for 13 multiple units (to be supplied jointly with MAN)

1977
Order for the construction of a power plant

1980
As prime contractor, Siemens constructs the first light rail transit system in Africa for Tunis. Siemens awarded a major contract for the Light Rail Transit System ''Métro Léger de Tunis'' in Tunisia

1983
Siemens supplies two 160MW steam turbines to the Sousse I power plant in Tunisia

1990
Siemens and the Belgian firm AETA S.A. found the local service and sales company ETTAS (Entreprise Tunisienne de Télécommunications Atea-Siemens), which undertakes the digitalization of the public telephone network

1995
ETTAS extends its activities to the area of IT solutions

1999
Siemens AG takes over 100% ownership of ETTAS. Siemens Tunisia, together with Tunisian partner companies, manages the sale of mobile devices and Fujitsu-Siemens products

2002
Siemens Tunisia becomes the most important technology partner of TUNISIANA, the largest private telecommunications provider

2003
Siemens Tunisia becomes a Regional Company and manages all the activities of Siemens in Tunisia