Number portability; unbundling

From ITUwiki

Introduction

One of the more important identifier resource management legal and regulatory requirements in competitive provisioning environments is that of identifier unbundling. The requirements are applied to the use of telephone E.164 identifiers in many countries - resulting in administrative provisions and resolution architectures that enable a portability of the number among different service providers. IETF domain names represent an identifier system also allowing for identifier portability. These policy requirements may also include strictures on geographic number portability.