Application of Recommendation E.164 Numbering Plan for Universal International Freephone Numbers for International Freephone Service Series E: Overall Network Operation Telephone Service Service Operation and Human Factors International Operation - Number
This Recommendation details the application of the ITU-T Rec.E.164 Numbering Plan for the Universal International Freephone Numbers (UIFN) in the provisioning of International Freephone Service (IFS) as defined in ITU-Rec. E.152. It has been amended and refined in the light of experience gained by service providers and the UIFN Registrar since the inauguration of the UIFN in early 1997.