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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"];
}