ITU-T E.353

To be able to meet the increasing demand of efficient utilization of numbering resources and to satisfy operational needs which will arise according to deregulation of the telecommunication market, there is a need to create an International Network Routing Addressing system. Without such an addressing system operators may need to allocate dedicated routing numbers (series) from the E.164 numbering plan for certain types of calls, e. g. calls to global services, due to national regulation and bilateral agreements. This Recommendation proposes formats for the International Network Routing Addresses, the Serving Service Provider Identification and provides guidance on how to route calls when using International Network Routing Addresses.