Krulykovskyi , B., and Yu. Stepaniuk. “Local PBX of an Enterprise Based on a Computer Network”. COMPUTER-INTEGRATED TECHNOLOGIES: EDUCATION, SCIENCE, PRODUCTION, no. 56 (September 28, 2024): 356-362. Accessed April 12, 2025. https://cit.lntu.edu.ua/index.php/cit/article/view/639.