The ITU-T considering that a maritime satellite service is being operated by the International Maritime Satellite Organization (Inmarsat); b) that data transmission services in the Inmarsat system should meet the provisions laid down for data transmission in general; c) that the mobile DTE may be connected to a PDN on a call-by-call basis; d) that mobile DTEs should have the capability of interfacing public data networks through all land earth stations even though they are located in different countries and interfacing different public data networks.