This document defines automatic roaming by describing the information flows between functional entities which occur in a number of automatic roaming scenarios.Rather than taking an abstract approach@ this document uses the information flows captured in the messages@ parameters@ and procedures defined in IS-41-B as its starting point. Additional information flows are specified in order to meet the requirements associated with the support of the features in TIA/EIA-664.The detailed encoding of the signaling messages and parameters which are derived from the information flows in this document are specified in TIA/EIA-41 Chapter 5.The detailed definition of the functional entity procedures associated with the information flows in this document are specified in TIA/EIA-41 Chapter 6.