13.		Conformance testing procedures for the teletex recommendations : recommendations T.64 / International Telecommunication Union Data Publicação: 1989 Tema: Vária
14.		Digital networks, digital sections and digital line systems : recommendations G.801 - G.961 / International Telecommunication Union Data Publicação: 1989 Tema: Vária
15.		Telephone network and ISDN : operation, numbering, routing and mobile service: recommendations E.100 - E.333 / International Telecommunication Union Data Publicação: 1989 Tema: Vária
16.		General maintenance principles : maintenance of international transmission systems and telephone circuits: recommendations M.10 - M.782 / International Telecommunication Union Data Publicação: 1989 Tema: Vária
17.		Specifications of signalling systems No. 7 : recommendations Q.700 - Q.716 / International Telecommunication Union Data Publicação: 1989 Tema: Vária
18.		Annex D to recommendation Z.100 SDL user guidelines/International Telecommunication Union Data Publicação: 1989 Tema: Vária
19.		General characteristics of international telephone connections and circuits : recommendations G.100 - G.181 / International Telecommunication Union Data Publicação: 1989 Tema: Vária
20.		Integrated services digital network (ISDN) : general structure and service capabilities: recommendations I.110 - I.257 / International Telecommunication Union Data Publicação: 1989 Tema: Vária
21.		Maintenance of international telegraph, phototelegraph and leased circuits : maintenance of the international public telephone network: maintenance of maritime satellite and data transmission systems: recommendations M.800 - M.1375 / International Telecommunication Union Data Publicação: 1989 Tema: Vária
22.		General recommendations on telephone switching and signalling : functions and information flows for service in the ISDN: supplements: recommendations Q.1- Q.118 bis / International Telecommunication Union Data Publicação: 1989 Tema: Vária