+0       socket(..., SOCK_STREAM, IPPROTO_SCTP) = 3
+0       setsockopt(3, IPPROTO_SCTP, SCTP_DELAYED_SACK, {sack_delay=10, sack_freq=2}, 12) = 0
+0       connect(3, ..., ...) = -1 EINPROGRESS (Operation now in progress)
+0     > sctp: INIT[flgs=0, tag=..., a_rwnd=..., os=2048, is=10, tsn=0, ...]
+0.05  < sctp: INIT_ACK[flgs=0, tag=22, a_rwnd=100000, os=2048, is=10, tsn=0, STATE_COOKIE[len=4, val=...]]
+0     > sctp: COOKIE_ECHO[flgs=0, len=4, val=...]
+0.05  < sctp: COOKIE_ACK[flgs=0]

+0.05  < sctp: DATA[flgs=BE, len=1016, tsn=0, sid=0, ssn=0, ppid=0] // Other flags allowed: IU
+0  > sctp: SACK[flgs=0, cum_tsn=0, a_rwnd=99000, gaps=[], dups=[]]
+0.05  read(3, ..., 1000) = 1000

+0.05  < sctp: DATA[flgs=BE, len=1016, tsn=1, sid=1, ssn=0, ppid=0] // Other flags allowed: IU
+0.01  > sctp: SACK[flgs=0, cum_tsn=1, a_rwnd=99000, gaps=[], dups=[]]
+0.05  read(3, ..., 1000) = 1000

+0.25    close(3) = 0
+0  > sctp: SHUTDOWN[flgs=0, cum_tsn=...]
+0.05  < sctp: SHUTDOWN_ACK[flgs=0]
+0  > sctp: SHUTDOWN_COMPLETE[flgs=0] // Other flags allowed: T, Is SHUTDOWN_COMPLETE[] allowed?