CCITT Rec.  F.127 (11/1988) – OPERATIONAL PROCEDURES FOR INTERWORKING BETWEEN THE TELEX SERVICE AND THE SERVICE OFFERED BY INMARSAT STANDARD-C SYSTEM
1 Definitions
2 Scope
3 Introduction
4 Service outline
5 Operational procedures
    5.1 Shore-to-ship calls
    5.2 Ship-to-shore calls
    5.3 Ship-to-ship calls