The interconnection of the networks of the countries and recognized operating agencies (ROA) participating in the international telex service requires the development of a standardized mechanism for the routing of calls between subscribers in a transparen
ITU-T F.69-1994 history
1994ITU-T F.69-1994 THE INTERNATIONAL TELEX SERVICE - SERVICE AND OPERATIONAL PROVISIONS OF TELEX DESTINATION CODES AND TELEX NETWORK IDENTIFICATION CODES