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