59 lines
2.7 KiB
Plaintext
59 lines
2.7 KiB
Plaintext
# MO-call with Osmux enable on 3GPP AoIP using A/IP with IPA/SCCPlite
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msc {
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hscale=2;
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ms [label="MS"], bts [label="OsmoBTS"], bsc[label="OsmoBSC"], mgw_bsc[label="OsmoMGW(bsc)"], m_sc[label="MSC"], mgw_msc[label="OsmoMGW(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 -> bsc [label="DTAP CM Service Request"];
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bsc -> m_sc [label="Complete Layer 3 Information DTAP CM Service Request"];
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bsc <- m_sc [label="Connection Confirmed"];
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# Allocate MGW/MSC Osmux endpoint
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m_sc -> mgw_msc [label="MGCP CRCX *@mgw, X-Osmux: *"];
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mgw_msc box mgw_msc [label="Bind to MGW-local Osmux Port (1984)\nAllocate new endpoint 1, MGW's local CID 5"];
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mgw_msc -> m_sc [label="MGCP CRCX rtpbridge/1@mgw OK (MGW:1984, X-Osmux: 5)"];
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bsc <- m_sc [label="BSSAP ASSGN REQ (CIC:1)"];
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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 Command"];
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ms -> bsc [label="Assignment Complete"];
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...;
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# connect BTS RTP with BSC-MGW RTP, CIC is used as MGW endpoint
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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 -> mgw_bsc [label="MGCP CRCX 1@mgw (BTS:1000)"];
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mgw_bsc box mgw_bsc [label="Bind to MGW-local RTP Port (2000)\nConnect to BTS:1000"];
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bsc <- mgw_bsc [label="MGCP CRCX 1@mgw OK (MGW:2000)"];
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bts <- bsc [label="IPA MDCX (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 ACK"];
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...;
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bsc -> m_sc [label="BSSMAP ASSGN Complete"];
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...;
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# MSC configures BSC-MGW MSC-side of the endpoint through MGCP UDP forwarding
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mgw_bsc <- m_sc [label="MGCP CRCX 1@mgw (MSC:1984, X-Osmux: 5)"];
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mgw_bsc box mgw_bsc [label="Bind to BTS-local Osmux Port (1985)\nAllocate new MGW's local CID 7"];
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mgw_bsc -> m_sc [label="MGCP CRCX 1@mgw OK (MGW:1985, X-Osmux: 7)"];
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mgw_bsc <- m_sc [label="MGCP MDCX 1@mgw (recvonly) "];
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mgw_bsc box mgw_bsc [label="Connect Osmux socket to remote (MSC) Osmux Port"];
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mgw_bsc -> m_sc [label="MGCP MDCX 1@mgw OK"];
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mgw_bsc <= mgw_msc [label="Osmux Audio MGW:1985 MSC:1984, CID(downlink):7"];
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bts <= mgw_bsc [label="RTP Audio BTS:1000 MGW:2000"];
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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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mgw_bsc <- m_sc [label="MGCP MDCX 1@mgw (sndrecv) "];
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mgw_bsc box mgw_bsc [label="Switch to bi-directional audio"];
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mgw_bsc -> m_sc [label="MGCP MDCX 1@mgw OK"];
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mgw_bsc <=> mgw_msc [label="Osmux Audio MGW:1985 MSC:1984, CID(uplink):5, CID(downlink):7"];
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bts <=> mgw_bsc [label="RTP Audio BTS:1000 MGW:2000"];
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ms <=> bts [label="Um Audio (bidirectional)"];
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}
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