History of ITU Portal – Documents & dynamic web pages

Green Book: Volume VI.2: Telephone Signalling and Switching: Common Clauses to the Standardized Systems; Specifications of Systems No.3, No. 4, No.5 and No. 8=5bis (Recommendations Q.101 to Q.232)

Green Book: Volume VI.3: Telephone Signalling and Switching: Specificationt of Systems No. 6, R1, R2 (Recommendations Q.251 to Q.388)

Green Book: Volume VI.4: Telephone Signalling and Switching: Questions of Study Groups XI and XIII; Supplements (Documentary Part)

Green Book: Volume VII: Telegraph Technique

Green Book: Volume VIII: Data Transmission

Provisional Recommendations X.3, X.25, X.28 and X.29 on Packet-Switched Data Transmission Services

Recommendations provisionaly adopted: X.75 Terminal and Transit Call Control Procedures and Data Transfer System on International Circuits Between Packet-Switched Data Networks; X.121 Internatioanl Numbering Plan for Public Data Networks

Orange Book: Volume I: Minutes and Reports of the Vlth Plenary Assembly of the CCITT; Resolutions and Opinions Issued by the CCITT; General Table of Study Groups and Working Parties for the period 1977-1980;

Orange Book: Index

Green Book: Volume I: Minutes and reports of the Vth Plenary Assembly of the CCITT; Resolutions and Opinions issued by the CCITT; General table of Study Groups and Working Parties for the period 1973-1976; Summary table of Questions under study in the period 1973-1976; Recommendations (Series A) on the organization of the work of the CCITT; Recommendations (Series B) relating to means of expression; Recommendations (Series C) relating to general telecommunication statistics.