Looking at http://www.kamailio.org/wiki/packages/debs
the suggestion is
to use http://deb.kamailio.org/
for debian packages.
But the last version of kamailio 4.0 here is 4.0.3, and 4.1 doesn't
exist. The most files are last modified in 2013-08.. Here for example:
Is there a new server to get the deb-packages from or should I build
from source from now on?