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ITU-T X.121 International numbering plan for public data networks
ITU-T A.23 Collaboration with the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC) on information technology
ITU-T A.13 Supplements to ITU-T Recommendations
ITU-T E.195 ITU-T International numbering resource administration
ITU-T E.169.3 Application of Recommendation E.164 numbering plan for universal international shared cost numbers for international shared cost service
ITU-T E.169.2 Application of Recommendation E.164 numbering plan for universal international premium rate numbers for the international premium rate service
ITU-T G.871/Y.1301 Framework of Optical Transport Network Recommendations
ITU-T G.992.1 Annex H Specific requirements for a synchronized symmetrical DSL (SSDSL) system operating in the same cable binder as ISDN as defined in ITU-T G.961 Appendix III
ITU-T G.705 Characteristics of plesiochronous digital hierarchy (PDH) equipment functional blocks
ITU-T D.600R Cost methodology for the regional tariff group for Africa applicable to the international automatic telephone service
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