Searching for an effective solution and creating a functional and affordable option of linking internal network while maintaining existing services and technologies, which implies the convergence of not only data but voice networks as well, can best be done in the practical test. The article focuses on the professional performance of the resulting solution to a specific task. Subject to verification was unguaranteed type of Internet connection using encrypted IPSec (AES256) tunnels via Astaro technology. Verification was first conducted under conditions of test wiring outside the real operation, followed by performing and validating during real data and voice transmission. Based on tests and analyzes of data transfers and dropouts it was able to design a functional and secure connection. The analysis included an actual traffic with ICMP protocol responses evaluation. The proposed solution is usage maximization for small and mediumsized organizations as well as affordable and acces...