Today’s communication is no longer limited to simple IP telephony using deskphones on an office desk.Rather, one encounters again and again buzz words unified communication, SIP trunking, online conferencing, anywhere workplace, E2EE etc.In my presentation on penetration testing of communication systems I will show you how these increasingly complex scenarios are tested for weaknesses and security issues.We will decrypt encrypted conversations, redirect media streams and attack communication systems from the public Internet.In addition to attack techniques and methods, you will also get to know suitable recommendations for the protection of communication systems.