digraph G {
rankdir=TB
labelloc=t; label="PFCP CP session FSM"

cp [label="CP function",shape=box]
cp -> WAIT_ESTABLISHMENT_RESP [label="cp_session_create(cp_peer)\niff cp_peer in state ASSOCIATED"]

txrx [label="PFCP socket",shape=box]

WAIT_ESTABLISHMENT_RESP -> txrx [label="tx_session_est_req()",style=dotted]
txrx -> WAIT_ESTABLISHMENT_RESP [label="EV_RX_SESSION_EST_RESP",style=dotted]

WAIT_ESTABLISHMENT_RESP -> ESTABLISHED [label="Est Resp"]

cp -> ESTABLISHED [label="cp_session_modify()",style=dotted]
ESTABLISHED -> WAIT_MODIFICATION_RESP [label="cp_session_modify()"]
WAIT_MODIFICATION_RESP -> txrx [label="tx_session_mod_req()",style=dotted]
txrx -> WAIT_MODIFICATION_RESP [label="EV_RX_SESSION_MOD_RESP",style=dotted,constraint=false]
WAIT_MODIFICATION_RESP -> ESTABLISHED [label="Mod Resp"]

cp -> ESTABLISHED [label="cp_session_delete()",style=dotted]
ESTABLISHED -> WAIT_DELETION_RESP [label="cp_session_delete()"]
WAIT_DELETION_RESP -> txrx [label="tx_session_del_req()",style=dotted]
txrx -> WAIT_DELETION_RESP [label="EV_RX_SESSION_DEL_RESP",style=dotted,constraint=false]
WAIT_DELETION_RESP -> term
term [shape="octagon"]

}