When subscribers roam outside of their home?areas, the serving MSC keeps track of their location and verifies the validity of their MIN by accessing the subscriber profile stored in their HLR.

• 用户漫游出他们的"归属"区域时，正在工作的 MSC 将跟踪他们的位置并通过访问 HLR 中存储的用户资料对他们的 MIN 进行验证。