ITU F.20:1988
ITU F.20:1988 The International Gentex Service
Table of Contents
1General2Call-numbersandanswer-backcodes
3Equipmentofpositionsintelegraph
offices
4Routinglists
5Telegramrouting
6Overflow
7Prohibitionofcommunicationswithtelex
subscribersinothercountries
8Operationofthegentexservice