In the present article, Constructive Approach is introduced for students, to model a simulation and develop a real system for VoIP. The main aim is to provide experiences on modeling and development of the real system with the equipment in the controlled laboratory environment by using established good laboratory and manufacturing practice. Developing systems, assigned to students, helped them to integrate their theoretical knowledge with their practical skills. Since classical courses are limited to the related theoretical knowledge given by an instructor, students can gain valuable experiences with fully developed functional simulation and the real system, important correlations and procedures, which are implemented in the engineering practice, and thus are introduced in this paper. ß