The outline description of the INMARSAT C system and the services it may support is contained in Supplement No. 3 to Fascicle 11.4 of the Blue Book (Melbourne, 1988). It is a feature of the service offered by the INMARSAT C system that access to and from the international telex service is to be supported by the service provider, the originating telex subscriber using either one- or two-stage selection depending on the particular MSSFU implementation. This Recommendation limits its application to one-stage access from the originating telex subscriber. Access using a two-stage selection procedure shall be in accordance with Recommendations F.72 and U.80. Administrations may provide either or both modes of operation. Access to the INMARSAT C system may be provided via the international telex network across international boundaries on a bilateral basis.