Index of blue book / International Telecommunication Union
General tariff principles : charging and accounting in international telecommunication services: Series D recommendations / International Telecommunication Union
Telegraph and mobile services operations and quality of service : recommendations F.1 - F.140 / International Telecommunication Union
Telematic, data transmission and teleconference services operations and quality of service : recommendations F.160 - F.353, F.600, F.601, F.710 - F.730 / International Telecommunication Union