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msc {
hscale=2;
UE, MME, VLR [label="MSC/VLR"], HSS [label="HSS/HLR"], SMSC;
UE box HSS [label="EPS/IMSI attach procedure"];
...;
VLR <= SMSC [label="MAP/GSUP ForwardSM"];
MME <= VLR [label="SGsAP PAGING"];
UE <= MME [label="Paging"];
UE box MME [label="Service Request"];
MME => VLR [label="SGsAP SERVICE REQ"];
MME <= VLR [label="SGsAP DL UNITDATA\n(CP-DATA/RP-DATA/TPDU)"];
UE <= MME [label="DL NAS Transport"];
UE => MME [label="UL NAS Transport"];
MME => VLR [label="SGsAP UL UNITDATA"];
...;
UE => MME [label="UL NAS Transport"];
MME => VLR [label="SGsAP UL UNITDATA"];
VLR => SMSC [label="Delivery report"];
MME <= VLR [label="SGsAP RELEASE REQ"];
}
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