Group calls in Threema are end-to-end encrypted and currently available for up to 16 participants. An invitation URL is not necessary; the group members chat can decide whether to join a call or not.
Group calls are routed through a server, which obscures the IP address of the participants amongst one another. To make sure participants hear in real time what others are saying (i.e., the delay is as short as possible), media routers outside of Switzerland may be used. Learn more…