Abstract: The study addresses the issues of development and functioning of the software and hardware system intended to provide secure and reliable communications for remote corporate subscribers over the networks with cellular or wireless internet access. The system requirements necessary to maintain secure connection of end users are indicated and discussed. Based on the analysis of existing solutions, the structure of novel software and hardware system which fulfills indicated requirements was proposed, implemented and tested in several Russian and Canadian companies. Results showed that developed system allows secure and high quality voice and data transmission between subscribers over the 3, 4G and Wi-Fi mobile telecom standards.