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ＧＳＭ移动通信系统为网络运营者和用户提供了对漫游进行有效限制的管理能力。本文介绍了ＧＳＭ系统中与漫游限制有关的网络功能———漫游ＯＤＢ和用户业务———区域签约，并介绍了相应的信令流程。
The GSM mobile communication system provides network operators and users with management capabilities that effectively limit roaming. This article introduces the GSM system and roaming restrictions related to network functions --- roaming ODB and subscribers --- regional contract, and introduced the corresponding signaling flow.