Network Reference - Gateway

There are currently two commercial Iridium gateways located in Arizona, United States and Fucino, Italy. The U.S. government owns and operates an Iridium gateway located in Hawaii, United States. Each gateway generates and controls all user information pertaining to its registered users, such as user identity, geo-location and billing items. The gateway also provides connectivity from the Iridium system to the terrestrial based networks such as the PSTN (public switched telephone network), DSN (defense switched network), Internet, NIPRNet, etc. Although there are multiple gateways, a user is registered to a single gateway.

Iridium Gateway
Gateway