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The Phone Operation Center (powered by Eventphone) will be present at the 28C3 this year again with a mobile DECT system and phone infrastructure.

You can bring your own DECT phone and register it at the 28C3. So you will be able to call other 28C3 participants for free. To secure your personal extension in advance please register and then enter your extensions in the phonebook.

Additionally we will have outside connectivity via PRI-ISDN over IP tunnel. For more information visit the Linux-Call-Router project.



The extension registration is open:

Dial In

This year our dial-in number is +49-531-349439-XXXX, where XXXX is the extension number inside the congress.

Dial Out

The Dialout is not available yet. It is unsure, if a dial out will exist at this event.


This year you can also register with your GSM phone. On the registration page at you can add your mobile GSM/UMTS phone too.

Your SIM card is now registered to our GSM network. You may change the extension number any time by entering a different token, or change the phone by entering the token there.

We have a GSM helpdesk close to the POC desk. For more information visit the Linux-Call-Router project.

Please also look in the GSM article for more detailed and more up-to-date information: GSM#How_can_I_participate_in_the_network

After the Congress

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

Special numbers

Number Function
6283 Mate-O-Meter
7666 Voicebarf (Next lectures)
8463 Time
8484 HackerHotline
8666 Special Services
8888 Mailbox
8124 music/lorem ipsum
8001 Saal 1
8101 Saal 1 (DE --> EN simultaneous interpretation, if offered)
8002 Saal 2
8003 Saal 3
2088 labyrinth
8123 PoC menu
8124 music/lorem ipsum


Will sipdroid work with the Eventphone setup?

At camp11 sipdroit worked for me. But in general DECT ist more reliable, as wi-fi ob 2.4 GHz doesn't have as many different channels. Also note that there is already and sip client included in recent versions of android. --Andi 19:57, 26 December 2011 (CET)

Please note : for GSM releated Queastions ask there : GSM#User_Questions

How to edit the compatibility list on the eventphone wiki? It's outdated.

Archived page - Impressum/Datenschutz