The seminar deals with communication technologies for the disaster case (satellite, 4G/5G, TETRA etc.) with main focus on alerting. The OASIS standard suite Emergency Data Exchange Language (EDXL) will be introduced and the therein included standard used world-wide for alerting: the common alerting protocol (CAP). The usage of different medias (cell broadcast, apps etc.) will be discussed together with their characteristics as well as the latest advances in research towards alerting via the Galileo system. Link between the topics is CAP which as a platform independent enabler provides the means for public warning and communication between authorities. Additionally, the guidelines and progress of the ETSI Emergency Communication (EMTEL) working group will be presented including the Next Generation (NG)-112.