72 lines
2.5 KiB
Plaintext
72 lines
2.5 KiB
Plaintext
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# MO-Call with OsmoBTS + OsmoBSC with true 3GPP AoIP (planned)
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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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m_sc box m_sc [label="Bind arbitrary local port (4000)"];
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bsc <- m_sc [label="BSSAP ASSGN 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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# connect BTS RTP with BSC-MGW RTP
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bts <- bsc [label="IPA CRCX"];
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bts box bts [label="Bind to BTS-local RTP Port (1000)"];
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bts -> bsc [label="IPA CRCX ACK (BTS:1000)"];
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bsc -> mgcp [label="MGCP CRCX 2@abis (BTS:1000)"];
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mgcp box mgcp [label="Bind to MGW-local RTP Port (2000)\nConnect to BTS:1000"];
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bsc <- mgcp [label="MGCP CRCX 2@abis OK (MGW:2000)"];
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bts <- bsc [label="IPA MDCX 2@abis (MGW:2000)"];
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bts box bts [label="Connect RTP socket to remote (MGW) RTP Port"];
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bts -> bsc [label="IPA MDCX 2@abis ACK"];
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#bsc -> mgcp [label="MGCP MDCX 2@abis (optional)"];
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#bsc <- mgcp [label="MGCP MDCX 2@abis OK (optional)"];
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...;
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mgcp <- bsc [label="MGCP CRCX 1@a (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 1@a OK (MGW:3000)"];
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...;
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bsc -> m_sc [label="BSSAP ASSGN CMPL (3GPP AoIP MGW:3000)"];
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m_sc box m_sc [label="Connect remote RTP to MGW addr from ASSGN 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="RTP Audio BTS:1000 MGW:2000"];
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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 1@a"];
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mgcp box mgcp [label="Release MSC-facing local RTP port (3000)"];
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mgcp -> bsc [label="MGCP DLCX 1@a OK"];
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bsc -> mgcp [label="MGCP DLCX 2@abis"];
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mgcp box mgcp [label="Release BTS-facing local RTP port (2000)"];
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bsc <- mgcp [label="MGCP DLCX 2@abis OK"];
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bts <- bsc [label="IPA DLCX"];
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bts box bts [label="Release BTS-local RTP port (1000)"];
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bts -> bsc [label="IPA DLCX OK"];
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}
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