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msc {
hscale=2;
UE, ENB [label="eNodeB"], BSS, MME, VLR [label="MSC/VLR"], HSS [label="HSS/HLR"];
UE => MME [label="NAS Extended Service Request"];
ENB <= MME [label="S1-AP UE Context Mod Req with CSFB"];
ENB => MME [label="S1-AP UE Context Mod Resp"];
UE <= ENB [label="NACC (Network Assisted Cell Change)"];
ENB => MME [label="S1-AP S1 UE Context Release Req"];
UE box MME [label="S1 UE Context Release"];
UE box HSS [label="UE changes RAT then LA and/or RA update"];
UE <=> HSS [label="PS Suspend (TS 23.060)"];
UE => BSS [label="CM SERV REQ"];
BSS => VLR [label="COMPL L3 (CM SERV REQ)"];
UE <=> VLR [label="Normal 2G Voice Call"];
}
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