Visitor Location Register (VLR)

Some networks provide Visitor Location Registers (VLR) at their MSCs (Mobile Switching Center), such that, one an MS (Mobile Station) roams from a different traffic area, the subscriber information from its HLR (Home Location Register) can be transmitted to and temporarily stored in the VLR. VLRs prevent unnecessary, potentially long-distance, repeated communication with the HLR.

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