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# MO-Call with OsmoBTS + OsmoBSC with true 3GPP AoIP
msc {
hscale=2;
ms [label="MS"], bts [label="OsmoBTS\n1.1.1.1"], bsc[label="OsmoBSC"], mgcp[label="OsmoMGW@BSC\n3.3.3.3"], m_sc[label="MSC"], mgw_m[label="MGW@MSC\n5.5.5.5"];
ms box m_sc [label="We assume a SDCCH is already established"];
...;
ms -> m_sc [label="DTAP CC SETUP"];
ms <- m_sc [label="DTAP CC CALL PROCEEDING"];
m_sc -> mgw_m [label="Request allocation of local RTP port"];
m_sc <- mgw_m [label="Respond with RTP port the MGW bound to (5.5.5.5:4000)"];
bsc <- m_sc [label="BSSAP ASSIGN REQ (3GPP AoIP, CN RTP IP/Port 5.5.5.5:4000)"];
bts <- bsc [label="RSL CHAN ACT (TCH)"];
bts -> bsc [label="RSL CHAN ACT ACK"];
ms <-> bsc [label="RR Assignment of TCH"];
...;
# connect BTS RTP with BSC-MGW RTP
bts <- bsc [label="IPA CRCX"];
bts box bts [label="Bind to BTS-local RTP Port (1.1.1.1:1000)"];
bts -> bsc [label="IPA CRCX ACK (1.1.1.1:1000)"];
bsc -> mgcp [label="MGCP CRCX rtpbridge/2@mgw (1.1.1.1:1000)"];
mgcp box mgcp [label="Bind to MGW-local RTP Port (3.3.3.3:2000)\nConnect to 1.1.1.1:1000"];
bsc <- mgcp [label="MGCP CRCX rtpbridge/2@mgw OK (3.3.3.3:2000)"];
bts <- bsc [label="IPA MDCX (3.3.3.3:2000)"];
bts box bts [label="Connect RTP socket to remote (MGW) RTP Port"];
bts -> bsc [label="IPA MDCX ACK"];
bsc -> mgcp [label="MGCP MDCX rtpbridge/2@mgw (optional)"];
bsc <- mgcp [label="MGCP MDCX rtpbridge/2@mgw OK (optional)"];
...;
mgcp <- bsc [label="MGCP CRCX rtpbridge/2@mgw (5.5.5.5:4000)"];
mgcp box mgcp [label="Bind to MGW-local RTP Port (3.3.3.3:3000)\nConnect to 5.5.5.5:4000"];
mgcp -> bsc [label="MGCP CRCX rtpbridge/2@mgw OK (3.3.3.3:3000)"];
...;
bsc -> m_sc [label="BSSAP ASSIGN CMPL (3GPP AoIP 3.3.3.3:3000)"];
m_sc -> mgw_m [label="Request MGW to connect RTP to remote endpoint 3.3.3.3:3000"];
mgw_m box mgw_m [label="Connect RTP to 3.3.3.3:3000"];
...;
mgcp <=> mgw_m [label="RTP Audio 3.3.3.3:3000 5.5.5.5:4000"];
bts <=> mgcp [label="RTP Audio 1.1.1.1:1000 3.3.3.3:2000"];
ms <=> bts [label="Um Audio (bidirectional)"];
ms <-> m_sc [label="DTAP CC ALERTING"];
...;
ms <- m_sc [label="DTAP CC CONNECT"];
ms -> m_sc [label="DTAP CC CONNECT ACK"];
--- [label="Voice Call in Progress"];
ms <- m_sc [label="DTAP CC DISCONNET"];
ms <- m_sc [label="DTAP CC RELEASE"];
ms <- m_sc [label="DTAP CC RELEASE COMPL"];
...;
bsc <- m_sc [label="BSSMAP CLEAR CMD"];
m_sc -> mgw_m [label="Request release RTP port/termination"];
mgw_m box mgw_m [label="Release RTP port 5.5.5.5:4000"];
bsc -> m_sc [label="BSSMAP CLEAR COMPL"];
bsc <- m_sc [label="SCCP RLSD"];
bsc -> m_sc [label="SCCP RLC"];
...;
mgcp <- bsc [label="MGCP DLCX rtpbridge/2@mgw"];
mgcp box mgcp [label="Release MSC-facing local RTP port (3.3.3.3:3000)"];
mgcp -> bsc [label="MGCP DLCX rtpbridge/2@mgw OK"];
mgcp <- bsc [label="MGCP DLCX rtpbridge/2@mgw"];
mgcp box mgcp [label="Release BTS-facing local RTP port (3.3.3.3:2000)"];
mgcp -> bsc [label="MGCP DLCX rtpbridge/2@mgw OK"];
bts <- bsc [label="IPA DLCX"];
bts box bts [label="Release BTS-local RTP port (1.1.1.1:1000)"];
bts -> bsc [label="IPA DLCX OK"];
}
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