They operate several different networks for voice communications during the events. From what I found usually DECT, SIP, GSM. [1] They have a status dashboard w

They operate several different networks for voice communications during the events. From what I found usually DECT, SIP, GSM. [1] They have a status dashboard with metrics during the events. [2] [1] https://events.ccc.de/2024/12/22/38c3-poc-isdn-version/ https://events.ccc.de/2024/12/22/38c3-poc-isdn-version/ [2] https://dashboard.eventphone.de/d/de7sgxz63vzeoe/38c3?orgId=1&from=now-7d&to=now&timezone=browser&refresh=5m https://dashboard.eventphone.de/d/de7sgxz63vzeoe/38c3?orgId=...