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msc {
hscale=3;
msc1[label="osmo-msc"], mncc1[label="MNCC FSM\n(osmo-msc mncc_call.c)"], sipcon1[label="osmo-sip-connector"], sip[label="PBX"], sipcon2[label="osmo-sip-connector"], mncc2[label="MNCC FSM\n(osmo-msc mncc_call.c)"], msc2[label="osmo-msc"];
msc1 note sipcon1 [label="MO call"];
sipcon2 note msc2 [label="MT call"];
mncc1 abox mncc1 [label="MNCC_CALL_ST_NOT_STARTED"];
msc1 rbox msc1 [label="mncc_outgoing_start()"];
msc1 -> mncc1 [label="MNCC_CALL_EV_OUTGOING_START"];
mncc1 abox mncc1 [label="MNCC_CALL_ST_OUTGOING_WAIT_PROCEEDING"];
mncc1 => sipcon1 [label="MNCC_SETUP_IND
\n callref, IMSI, called and calling number, SDP"];
sipcon1 => sip [label="SIP INVITE
\n from, to, SDP"];
sipcon1 <= sip [label="SIP 100 Trying"];
mncc1 <= sipcon1 [label="MNCC_RTP_CREATE
\n callref"];
mncc1 rbox mncc1 [label="mncc_rx_rtp_create()"];
mncc1 => sipcon1 [label="MNCC_RTP_CREATE
\n callref, RTP IP address and port"];
mncc1 <= sipcon1 [label="MNCC_CALL_PROC_REQ
\n callref, RTP IP address and port"];
mncc1 abox mncc1 [label="MNCC_CALL_ST_OUTGOING_WAIT_COMPLETE"];
sip => sipcon2 [label="SIP INVITE
\n from, to, SDP"];
sipcon2 => sip [label="SIP 100 Trying"];
msc2 <= sipcon2 [label="MNCC_SETUP_REQ
\n callref, called and calling number
\n SDP"];
mncc2 abox mncc2 [label="MNCC_CALL_ST_NOT_STARTED"];
msc2 rbox msc2 [label="mncc_incoming_start()"];
msc2 -> mncc2 [label="MNCC_CALL_EV_INCOMING_START"];
mncc2 abox mncc2 [label="MNCC_CALL_ST_INCOMING_WAIT_COMPLETE"];
mncc2 => sipcon2 [label="MNCC_CALL_CONF_IND
\n callref, bearer capabilities, cccap and IMSI, SDP?"];
mncc2 <= sipcon2 [label="MNCC_RTP_CREATE
\n callref"];
mncc2 rbox mncc2 [label="mncc_rx_rtp_create()"];
mncc2 => sipcon2 [label="MNCC_RTP_CREATE
\n callref, RTP IP address and port, SDP?"];
mncc2 => sipcon2 [label="MNCC_ALERT_IND
\n callref"];
sipcon2 => sip [label="SIP 180 Ringing
\n SDP"];
sipcon1 <= sip [label="SIP 180 Ringing
\n SDP"];
mncc1 <= sipcon1 [label="MNCC_ALERT_REQ
\n callref and progress"];
sipcon1 => sip [label="SIP PRACK 180 Ringing"];
sipcon1 <= sip [label="SIP PRACK 200"];
mncc1 <= sipcon1 [label="MNCC_RTP_CONNECT
\n callref, RTP IP and port"];
mncc1 rbox mncc1 [label="mncc_rx_rtp_connect()"];
msc1 <- mncc1 [label="rtp_stream_set_remote_addr()"];
mncc2 => sipcon2 [label="MNCC_SETUP_CNF
\n callref, imsi and connected number, SDP?"];
sipcon2 => sip [label="SIP 200 OK
\n SDP"];
mncc2 <= sipcon2 [label="MNCC_RTP_CONNECT
\n callref, RTP IP and port"];
mncc2 rbox mncc2 [label="mncc_rx_rtp_connect()"];
mncc2 <= sipcon2 [label="MNCC_SETUP_COMPL_REQ
\n callref"];
mncc2 abox mncc2 [label="MNCC_CALL_ST_TALKING"];
sipcon1 <= sip [label="SIP 200 OK INVITE"];
mncc1 <= sipcon1 [label="MNCC_SETUP_RSP
\n callref"];
mncc1 => sipcon1 [label="MNCC_SETUP_COMPL_IND
\n callref"];
mncc1 abox mncc1 [label="MNCC_CALL_ST_TALKING"];
sipcon1 => sip [label="SIP ACK"];
...;
... [label="Call goes on for a while..."];
...;
mncc1 rbox mncc1 [label="mncc_release()"];
mncc1 => sipcon1 [label="MNCC_DISC_IND
\n callref and cause"];
mncc1 abox mncc1 [label="MNCC_CALL_ST_WAIT_RELEASE_ACK"];
sipcon1 => sip [label="SIP BYE"];
sipcon1 <= sip [label="SIP 200 OK"];
mncc1 <= sipcon1 [label="MNCC_REL_REQ
\n callref and cause"];
sip => sipcon2 [label="SIP BYE"];
sip <= sipcon2 [label="SIP 200 OK"];
mncc2 <= sipcon2 [label="MNCC_DISC_REQ
\n callref and cause"];
mncc2 => sipcon2 [label="MNCC_REL_IND
\n callref and cause"];
mncc2 abox mncc2 [label="terminated"];
mncc1 => sipcon1 [label="MNCC_REL_CNF
\n callref"];
mncc1 abox mncc1 [label="terminated"];
}
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