Hi Claudio
Hmm, isn't swisstime one of the required ntp time sources for the lawful interception implementation?
Do you refer to: http://mathgen.ch/crypto/ch-ilets-regs2.pdf (interesting to find this in the net with a confitential stamp on it)?
I think this is superseded by
http://www.ejpd.admin.ch/content/dam/data/sicherheit/uepf/richtlinien/tr-ts-...
which specifies ntp.metas.ch
Cheers Serge