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msc {
hscale=2;
msc1[label="osmo-msc"], mncc1[label="MNCC FSM"], pbx[label="MNCC server (osmo-sip-connector)"], mncc2[label="MNCC FSM"], msc2[label="osmo-msc"];
mncc1 note mncc1 [label="The typical progression of an outgoing call, i.e. a call initiated by osmo-msc, as
implemented in mncc_fsm.h, mncc_fsm.c"];
mncc2 note mncc2 [label="The typical progression of an incoming call, i.e. a call initiated by the PBX, as
implemented in mncc_fsm.h, mncc_fsm.c"];
mncc1 abox mncc1 [label="MNCC_ST_NOT_STARTED"];
msc1 rbox msc1 [label="mncc_outgoing_start()"];
msc1 -> mncc1 [label="MNCC_EV_OUTGOING_START"];
mncc1 abox mncc1 [label="MNCC_ST_OUTGOING_WAIT_PROCEEDING"];
mncc1 => pbx [label="MNCC_SETUP_IND
\n callref, IMSI, called and calling number"];
mncc1 <= pbx [label="MNCC_RTP_CREATE
\n callref"];
mncc1 rbox mncc1 [label="mncc_rx_rtp_create()"];
mncc1 => pbx [label="MNCC_RTP_CREATE
\n callref, RTP IP address and port"];
mncc1 <= pbx [label="MNCC_CALL_PROC_REQ
\n callref, RTP IP address and port"];
mncc1 abox mncc1 [label="MNCC_ST_OUTGOING_WAIT_COMPLETE"];
msc2 <= pbx [label="MNCC_SETUP_REQ
\n callref, called and calling number"];
mncc2 abox mncc2 [label="MNCC_ST_NOT_STARTED"];
msc2 rbox msc2 [label="mncc_incoming_start()"];
msc2 -> mncc2 [label="MNCC_EV_INCOMING_START"];
mncc2 abox mncc2 [label="MNCC_ST_INCOMING_WAIT_COMPLETE"];
mncc2 => pbx [label="MNCC_CALL_CONF_IND
\n callref, bearer capabilities, cccap and IMSI"];
mncc2 <= pbx [label="MNCC_RTP_CREATE
\n callref"];
mncc2 rbox mncc2 [label="mncc_rx_rtp_create()"];
mncc2 => pbx [label="MNCC_RTP_CREATE
\n callref, RTP IP address and port"];
mncc2 => pbx [label="MNCC_ALERT_IND
\n callref"];
mncc1 <= pbx [label="MNCC_ALERT_REQ
\n callref and progress"];
mncc2 => pbx [label="MNCC_SETUP_CNF
\n callref, imsi and connected number"];
mncc2 <= pbx [label="MNCC_RTP_CONNECT
\n callref, RTP IP and port"];
mncc2 rbox mncc2 [label="mncc_rx_rtp_connect()"];
mncc2 <= pbx [label="MNCC_SETUP_COMPL_REQ
\n callref"];
mncc2 abox mncc2 [label="MNCC_ST_TALKING"];
mncc1 <= pbx [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()"];
mncc1 <= pbx [label="MNCC_SETUP_RSP
\n callref"];
mncc1 => pbx [label="MNCC_SETUP_COMPL_IND
\n callref"];
mncc1 abox mncc1 [label="MNCC_ST_TALKING"];
...;
... [label="Call goes on for a while..."];
...;
mncc1 rbox mncc1 [label="mncc_release()"];
mncc1 => pbx [label="MNCC_DISC_IND
\n callref and cause"];
mncc1 abox mncc1 [label="MNCC_ST_WAIT_RELEASE_ACK"];
mncc1 <= pbx [label="MNCC_REL_REQ
\n callref and cause"];
mncc2 <= pbx [label="MNCC_DISC_REQ
\n callref and cause"];
mncc2 => pbx [label="MNCC_REL_IND
\n callref and cause"];
mncc2 abox mncc2 [label="terminated"];
mncc1 => pbx [label="MNCC_REL_CNF
\n callref"];
mncc1 abox mncc1 [label="terminated"];
}
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