Despite the fact that teaching methodologies have been constantly evolving, the pandemic COVID-19 is forcing a much faster growth of these methodologies, mainly through the use of technological advances. Although in the literature there are some studies on the development of new remote teaching resources, few of them are specific to undergraduate engineering courses. In this way, this paper proposes the use of acoustic modems implemented in mobile devices, so that they can be used as remote teaching resources of telecommunications engineering courses. This application allows to measure the performance in terms of Bit Error Rate of a communication system for different parameters configured by users. The results obtained show a fairly acceptable performance.