digraph G {
        rankdir=LR;
        MS0 [label="MS"];
        MS1 [label="MS"];
        MS2 [label="MS"];
        MS3 [label="MS"];
        BTS0 [label="BTS"];
        BTS1 [label="BTS"];
        BSC [label="OsmoBSC"];
        MSC [label="OsmoMSC"];
        STP [label="OsmoSTP"];

	MS0 -> BTS0;
	MS1 -> BTS0;
	MS2 -> BTS1;
	MS3 -> BTS1;
	BTS0 -> BSC [label="Abis/IP"];
	BTS1 -> BSC [label="Abis/IP"];
	BSC -> STP [label="SCCP/M3UA"];
	STP -> MSC [label="SCCP/M3UA", dir="back"];
}