Update 1: some of the maintenance work will be performed in the afternoon of Monday, June 6, starting with 14:00 Berlin, Germany.
In the near future, likely next week, kamailio.org server will receive a maintenance upgrade. The exact date will be decided soon and announced on Kamailio mailing lists and other online channels.
Main affected services: website (including the wiki portal) and mailing lists.
Hopefully there will only be short downtime intervals. Anyhow, if it happens that you are trying to access kamailio.org and it is not responding, retry a bit later.
The #kamailio IRC channel on freenode.net server can be used for discussions during the upgrade interval.