1 files changed, 50 insertions, 0 deletions
diff --git a/doc/manuals/mgw/osmo-bsc-new-mgw-e1.msc b/doc/manuals/mgw/osmo-bsc-new-mgw-e1.msc
new file mode 100644
index 000000000..04b114fff
--- /dev/null
+++ b/doc/manuals/mgw/osmo-bsc-new-mgw-e1.msc
@@ -0,0 +1,50 @@
+# 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@mgw (MSC:4000)"];
+	mgcp box mgcp	[label="Bind to MGW-local RTP Port (3000)\nConnect to MSC:4000"];
+	mgcp -> bsc	[label="MGCP CRCX ts1/ss2@mgw 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@mgw"];
+	mgcp box mgcp	[label="Release MSC-facing local RTP port (3000)"];
+	mgcp -> bsc	[label="MGCP DLCX ts1/ss2@mgw OK"];
+}