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+digraph G {
+rankdir=TB;
+
+ mt [label="inter-BSC MT HO",shape=box];
+ gscon [label="gscon FSM",shape=box3d];
+ lchan [label="lchan FSM",shape=box3d];
+ msc [label="msc",shape=box3d];
+ old_bsc [label="old BSC",shape=box3d]
+ old_lchan [label="old lchan",shape=box3d]
+ term [label="terminate",shape=box];
+
+ invisible [style="invisible"]
+
+ mt -> old_bsc [style=dashed]
+ old_bsc -> msc [label="BSSMAP Handover Required",style=dashed]
+
+ invisible -> old_lchan [style=invisible,arrowhead=none]
+ msc -> gscon [label="BSSMAP Handover\nRequest",style=dashed]
+ gscon -> WAIT_LCHAN_ACTIVE [label="handover_start()",style=dashed]
+ WAIT_LCHAN_ACTIVE -> lchan [label="lchan_activate()\nFOR_HANDOVER",style=dashed]
+ lchan -> WAIT_LCHAN_ACTIVE [label="HO_EV_\nLCHAN_\nACTIVE,ERROR",style=dashed,constraint=false]
+ WAIT_LCHAN_ACTIVE -> WAIT_RR_HO_DETECT
+
+ WAIT_RR_HO_DETECT -> msc [label="BSSMAP\nHandover\nAccept\nwith\nRR Handover\nCommand",style=dashed,constraint=false]
+ msc -> old_bsc -> old_lchan [label="RR Handover\nCommand",style=dashed]
+
+ lchan -> WAIT_RR_HO_DETECT [label="RR Handover\nDetect",style=dashed]
+ WAIT_RR_HO_DETECT -> WAIT_RR_HO_COMPLETE
+
+ lchan -> WAIT_RR_HO_COMPLETE [label="RR Handover\nComplete",style=dashed]
+ WAIT_RR_HO_COMPLETE -> WAIT_LCHAN_ESTABLISHED
+ lchan -> WAIT_LCHAN_ESTABLISHED [label="HO_EV_LCHAN_\nESTABLISHED",style=dashed]
+
+ WAIT_LCHAN_ESTABLISHED -> term [label="non-TCH"]
+ WAIT_LCHAN_ESTABLISHED -> WAIT_MGW_ENDPOINT_TO_MSC
+ WAIT_MGW_ENDPOINT_TO_MSC -> term [label="handover_end()",style=dashed]
+ term -> msc [label="BSSMAP Handover\nComplete\n/ Failure",style=dashed,constraint=false]
+
+ err [label="on error",shape=box,style=dashed]
+ err -> term
+
+}