51 lines
1.7 KiB
Plaintext
51 lines
1.7 KiB
Plaintext
# MO-Call with E1 BTS + OsmoBSC with true 3GPP AoIP (planned
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# osmo-mgw has to be extended to true MGW functionality!
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msc {
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hscale=2;
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ms [label="MS"], bts [label="E1 BTS"], bsc[label="OsmoBSC"], mgcp[label="osmo-mgw"], 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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m_sc box m_sc [label="Bind arbitrary local port (4000)"];
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bsc <- m_sc [label="BSSAP ASSIGN REQ (3GPP AoIP MSC:4000)"];
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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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...;
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mgcp <- bsc [label="MGCP CRCX ts1/ss2@mgw (MSC:4000)"];
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mgcp box mgcp [label="Bind to MGW-local RTP Port (3000)\nConnect to MSC:4000"];
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mgcp -> bsc [label="MGCP CRCX ts1/ss2@mgw OK (MGW:3000)"];
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...;
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bsc -> m_sc [label="BSSAP ASSIGN CMPL (3GPP AoIP MGW:3000)"];
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m_sc box m_sc [label="Connect remote RTP to MGW addr from ASSIGN CMPL"];
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...;
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mgcp <=> m_sc [label="RTP Audio MGW:3000 MSC:4000"];
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bts <=> mgcp [label="TRAU Frame Audio (E1 TS1 SS2)"];
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ms <=> bts [label="Um Audio (bidirectional)"];
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ms <-> m_sc [label="DTAP CC ALERTING"];
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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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--- [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 <- bsc [label="MGCP DLCX ts1/ss2@mgw"];
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mgcp box mgcp [label="Release MSC-facing local RTP port (3000)"];
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mgcp -> bsc [label="MGCP DLCX ts1/ss2@mgw OK"];
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}
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