Secure Open-Line Telephone Device STB-251T for Enhanced Communication Safety

The device is a modified telephone in order to fulfil the "Information security requirements for terminal subscriber devices of open wire telephone communication systems placed in dedicated premises of state authorities' facilities on the territory of the Russian Federation. Conformity of the Device STB 251T to the information security requirements is confirmed by the Certificate of the Federal Security Service of Russia No. SF/SZI-0404 dated 30 July 2020, valid on 30 July 2025