Within the framework of the tasks developed by its Work Package 4 -which is in charge of the establishment for agreements for real time collaboration- the MAGIC Project has launch an on-line course on NRENum.net and DNS Configuration. With its contents fully developed both in English and Spanish, the course is opened to all those who are interested in NRENum, and mainly targeted to those NRENs that want to offer their member institutions the possibility of registering their equipments of videoconference and of voice over Ip in this global directory.