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