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msc {
hscale=2;
UE, ENB [label="eNodeB"], BSS, MME, VLR [label="MSC/VLR"], PSTN;
VLR <= PSTN [label="ISUP IAM or SIP INVITE"];
MME <= VLR [label="SGsAP PAGING REQUEST"];
ENB <= MME [label="Paging"];
UE <= MME [label="Paging"];
UE => MME [label="Extended Service Req"];
MME => VLR [label="SGsAP SERVICE REQUEST"];
ENB <= MME [label="Initial UE Ctx Setup"];
UE => BSS [label="Paging Response"];
BSS => VLR [label="COMPL L3 (PAGING RESP)"];
UE <=> VLR [label="Normal 2G Voice Call"];
}
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