Section: Annex B (normative): Single IMSI architecture for EU Roaming B.0 General
Content: To enable the sale of regulated roaming services, an architecture based on 3GPP has been defined in the high-level technical specification EU Roaming regulation III; Structural Solutions; High Level Technical Specifications [298]. A real-time interface has been defined in EU Roaming regulation III; Interface & Protocol; Detailed Technical Specifications [299] for retailing billing of voice calls between a Domestic Service Provider and an Alternative Roaming Provider. For the purposes of this annex, the following definitions apply: Alternative Roaming Provider (ARP): A roaming provider different from the domestic provider. Domestic Service Provider (DSP): An undertaking that provides a roaming customer with domestic mobile communications services, either a Mobile Network Operator or a Mobile Virtual Network Operator.