There will obviously again be a ISDN+POTS wired network at #40C3 like in recent years. With interconnection to @eventphone and @c3gsm.
Please bring your analog or ISDN phones, fax machines, modems, terminal adapters, video phones, etc.
And don't forget to bring long telephone cables, as the line to the nearest access multiplexer is your responsibility. #retronetworking #telephony #isdn