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The Phone Operation Center (powered by Eventphone) will be present at the 33C3 this year again with a mobile DECT system and phone infrastructure. After setting up 40 base stations almost the entire area of the CCH is covered by DECT mobile telephony reception.

You can bring your own DECT phone and register it at the 33C3. So you will be able to call other 33C3 participants for free.

Use the DECT Phone Compatibility List to find out if a phone is known as definitely working or definitely not working.

This year will be the 12th consecutive congress with Eventphone.


To secure your personal extension in advance please signup and register your DECT/SIP/ISDN/GSM extension here.


We plan to have outside connectivity via PRI-ISDN over IP tunnel again. For more information visit the Linux-Call-Router project.

PSTN Dialin: +49 40-231889-xxxx (to be confirmed)


It is also possible to dial external german landline and mobile phone numbers. A short introduction can be found at the Linux-Call-Router project.


There will be GSM this year. But don't expect it to be working before Day 1. Also bring your old SIM cards. More info => GSM

After the Congress

If you don't need your DECT phone anymore after the Congress consider giving it to the POC for organizing future events.


Between Events you can still be connected to us. Register a Number in our EPVPN.

Special numbers

Number Function
2088 labyrinth
8123 PoC menu
8124 music/lorem ipsum
6283 Mate-O-Meter
8463 Time
8666 Special Services
8888 Mailbox
8124 music/lorem ipsum
8001 Saal 1
8011 Saal 1 (simultaneous translation, if offered)
8021 Saal 1 (second simultaneous translation, if offered)
8002 Saal 2
8012 Saal 2 (simultaneous translation, if offered)
8022 Saal 2 (second simultaneous translation, if offered)
8004 Saal G
8014 Saal G (simultaneous translation, if offered)
8006 Saal 6
8016 Saal 6 (simultaneous translation, if offered)

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