TOPEX enhanced IP VCS solution, successfully tested at ROMATSA - TOPEX successfully tested an improved VCS solution at Romanian Air Traffic Services Administration (ROMATSA) with Multi Frequency Coding (MFC) Signaling Converter which assures transportation of this protocol over the Internet according to EUROCONTROL specifications. TOPEX VCS solution has been implemented at Romanian Air Traffic Services Administration for over five years and allows its configuration for a very wide range of applications in the ATC field. Due to excellent collaboration certified by traditional long business relations, ROMATSA, the organization providing the achievement of the air traffic control, chose to test TOPEX improved solution. During these tests, the new ground-ground communication network between Air Traffic Control Centers from ROMATSA was provided by TOPEX VCS via MFC connections. The purpose of the MFC network is to connect many single units to a powerful and dedicated infrastructure.