The POC team builds and runs the DECT and SIP networks at BornHack.
Phone book available here: https://hack.org/raccoon/bh2019/poc/phonebook.html
To register or borrow a phone, please stop by the IRC channel or POC tent at the camp venue.
A list of compatible handsets can be found at Eventphone wiki: https://eventphone.de/doku/dect_phone_compatibility_list
We cannot however guarantee 100% support of every model suggested in that article since there are differences in equipment on site.
The POC Team does not have a public mailing list, but it can be contacted through our main email email@example.com.
The POC Team public IRC channel is #bornhack-poc on irc.baconsvin.org.