The movement to develop a WIN strategy was originally triggered by wireless network operators under the auspices of the Cellular Telecommunications Industry Association (CTIA). They developed a set of requirements calling for industry standards that defined new network architecture incorporating the service flexibility of INs with the mobility aspects of wireless networks.

The first phase of WIN standards was published in 1999 and established the fundamental call models and operations required to support this flexible service architecture. Many service providers currently implement WIN Phase 1 in their networks. Examples of WIN Phase 1 services are calling name presentation and restriction, call screening, and voice-control services.

Nearing completion are WIN Phase-2 standards that provide both additional service capabilities for wireless operators as well as greater harmonization of network capabilities and operations with emerging third-generation network requirements. WIN Phase 2 includes MSC triggers for an IN prepaid solution.

WIN Phase 3 is currently in requirements review by the WIN standards group. This phase incorporates enhancements to support location-based services. These requirements are based on four service drivers: location-based charging, fleet and asset management service, enhanced call routing service, and location-based information service.