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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
}
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