| OB No. | | Position on | Rec. |
|---|
| 1283 | List of issuer identifier numbers (In accordance with Recommendation ITU-T E.118 (05/2006)) | | E.118 |
| 1280 | Mobile Network Codes (MNC) for the international identification plan for public networks and subscriptions (According to Recommendation ITU-T E.212 (09/2016)) | | E.212 |
| 1251 | Status of Radiocommunications between Amateur Stations of different Countries (In accordance with optional provision No. 25.1 of the Radio Regulations) and Form of Call Signs assigned by each Administration to its Amateur and Experimental Stations | | RR 25.1 |
| 1199 | List of International Signalling Point Codes (ISPC) (According to Recommendation ITU-T Q.708 (03/99)) | | Q.708 |
| 1125 | List of Signalling Area/Network Codes (SANC) | 01/06/2017 | Q.708 |
| 1125 | List of terrestrial trunk radio mobile country codes | 01/06/2017 | E.218(2017) |
| 1117 | List of Mobile Country or Geographical Area Codes | 01/02/2017 | E.212 |
| 1114 | List of Recommendation ITU-T E.164 assigned country codes | 15/12/2016 | E.164 |
| 1060 | List of ITU carrier codes (According to Recommendation ITU-T M.1400 (03/2013)) | 15/09/2014 | |
| 1015 | List of Access codes/numbers for mobile networks | 01/11/2012 | E.164 |
| 1002 | List of Country or Geographical Area Codes for non standard facilities in telematic services | 15/04/2012 | T.35 |
| 1001 | List of the national authorities designated to assign ITU-T Recommendation T.35 terminal provider codes | 01/04/2012 | T.35 |
| 1000 | Service restrictions | 15/03/2012 | |
| 994 | Dialling procedures (international prefix, national (trunk) prefix and national (significant) number) (in accordance with ITU-T Recommendation E.164 (11/2010)) | 15/12/2011 | E.164 |
| 991 | Call-Back and alternative calling procedures (Res. 21 Rev. PP-2006) | 01/11/2011 | Res. 21 PP-2006 |
| 980 | List of telegram destination indicators | 15/05/2011 | F.32 |
| 978 | List of Telex Destination Codes (TDC) and Telex Network Identification Codes (TNIC) | 15/04/2011 | F.68 / F.69 |
| 977 | List of Data Network Identification Codes (DNIC) | 01/04/2011 | X.121 |
| 976 | List of Data Country or Geographical Area Codes | 15/03/2011 | X.121 |
| 974 | List of Names of Administration Management Domains (ADMD) | 15/02/2011 | F.400 / X.400 |
| 955 | Various tones used in national networks (According to ITU-T Recommendation E.180) (03/1998) | 01/05/2010 | E.180 |
| 669 | Five-letter Code Groups for the use of the International Public Telegram Service | 01/06/1998 | F.1 |
