https://www.cnet.com/news/skype-launches-50-person-video-call-feature/

"We added a notification to replace the ringing as the default, allowing every member of the group to receive a quick ping to join the call," Skype said. "These notifications are a simple, unobtrusive way to get your calls and meetings (be it between family, friends, podcast guests, or co-workers) started."

Skype said individual members can ring into the call session or, if the group is less than 25 people, you can ring the entire group at once.