digraph G {
	rankdir = LR;
	subgraph cluster_RAN {
		OsmoBTS1 [label="OsmoBTS"];
		OsmoBTS2 [label="OsmoBTS"];
		OsmoBSC;
		OsmoMGW [label="OsmoMGW\n(for BSC)"];

		OsmoBTS1 -> OsmoBSC [label="Abis/IP", dir="both"];
		OsmoBTS2 -> OsmoBSC [label="Abis/IP", dir="both"];
		OsmoBSC -> OsmoMGW [label="MGCP", dir="both"];
		{ rank = same; OsmoBSC; OsmoMGW }

		OsmoBTS1 -> OsmoMGW [label="RTP", dir="both"];
		OsmoBTS2 -> OsmoMGW [label="RTP", dir="both"];

		label = "RAN";
	}
	subgraph cluster_CN {
		OsmoMGW1 [label="OsmoMGW\n(for MSC)"];
		OsmoMSC [label="MSC\ne.g. OsmoMSC"];
		Core [label="Other CN Elements"];
		OsmoMSC -> Core [label="MAP/ISUP/SIP/GSUP", dir="both"];
		OsmoMSC -> OsmoMGW1 [label="MGCP", dir="both"];
		{ rank = same; OsmoMSC; OsmoMGW1 }
		OsmoMGW -> OsmoMGW1 [label="Osmux", dir="both", color=red];
		OsmoMGW1 -> Core [label="RTP", dir="both"];
		label = "CN";
	}

	OsmoBSC -> OsmoMSC [label="3GPP AoIP\nvia SIGTRAN/STP", dir="both"];
}