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# MO-Call with OsmoBTS + OsmoBSC using A/IP with IPA/SCCPlite
# Supported since 2010 using osmo-bsc + osmo-bsc_nat
msc {
hscale=2;
ms [label="MS"], bts [label="OsmoBTS"], bsc[label="OsmoBSC"], mgcp[label="osmo-bsc_mgcp"], m_sc[label="MSC"];
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"];
bsc <- m_sc [label="BSSAP ASSGN REQ"];
bts <- bsc [label="RSL CHAN ACT"];
bts -> bsc [label="RSL CHAN ACT ACK"];
ms <-> bsc [label="Assignment"];
bsc -> m_sc [label="BSSAP ASSGN CMPL"];
...;
bts <- bsc [label="IPA CRCX"];
bts box bts [label="Bind to BSC-local RTP Port"];
bts -> bsc [label="IPA CRCX ACK"];
bts <- bsc [label="IPA MDCX"];
bts box bts [label="Connect RTP socket to remote (bsc_mgcp) RTP Port"];
bts -> bsc [label="IPA MDCX ACK"];
mgcp <- m_sc [label="MGCP CRCX 1@mgw"];
mgcp box mgcp [label="Bind to BTS-local RTP Port"];
mgcp -> m_sc [label="MGCP CRCX 1@mgw OK"];
mgcp <- m_sc [label="MGCP MDCX 1@mgw (recvonly) "];
mgcp box mgcp [label="Connect RTP socket to remote (MSC) RTP Port"];
mgcp -> m_sc [label="MGCP MDCX 1@mgw OK"];
mgcp <= m_sc [label="RTP Audio"];
bts <= mgcp [label="RTP Audio"];
ms <= bts [label="Um Audio (unidirectional)"];
ms <- m_sc [label="DTAP CC ALERTING"];
...;
mgcp <- m_sc [label="MGCP MDCX (sndrecv) "];
mgcp box mgcp [label="Switch to bi-directional audio"];
mgcp -> m_sc [label="MGCP MDCX OK"];
mgcp <=> m_sc [label="RTP Audio"];
bts <=> mgcp [label="RTP Audio"];
ms <=> bts [label="Um Audio (bidirectional)"];
...;
ms <- m_sc [label="DTAP CC CONNECT"];
ms -> m_sc [label="DTAP CC CONNECT ACK"];
mgcp <- m_sc [label="MGCP MDCX 1@mgw (sndrecv) "];
mgcp box mgcp [label="Why?"];
mgcp -> m_sc [label="MGCP MDCX 1@mgw OK"];
--- [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"];
bsc -> m_sc [label="BSSMAP CLEAR COMPL"];
bsc <- m_sc [label="SCCP RLSD"];
bsc -> m_sc [label="SCCP RLC"];
...;
mgcp <- m_sc [label="MGCP DLCX 1@mgw"];
mgcp box mgcp [label="Release local RTP port"];
mgcp -> m_sc [label="MGCP DLCX 1@mgw OK"];
}
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