Opennet
Opennetworks Kft.
Budapest, Fehérvári út 50-52, 1117
(06 1) 999 6000
RETN
RETN Poland Sp. Z.o.o lett 02-255 Warsaw, PolandUl. Krakowiakow 48.
+44 20 7517 6400
Swisscom
Swisscom (Switzerland) Ltd.
IP-Plus engineering, Postfach, CH-3050, Bern, Switzerland
+41-58-221-98