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msc {
UE, MME, VLR [label="MSC/VLR"], HSS [label="HSS/HLR"];
UE => MME [label="Attach Request"];
UE box HSS [label="Steps 3..16 of LTE Attach procedure TS 23.401"];
MME box MME [label="Derive VLR Number"];
MME => VLR [label="LU Request"];
VLR box VLR [label="Create SGs Association"];
VLR box HSS [label="MAP/GSUP UL / ISD"];
MME <= VLR [label="LU Accept"];
UE box HSS [label="Steps 17..16 of LTE Attach procedure TS 23.401"];
|||;
...;
MME <= VLR [label="Paging Request"];
}
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