# MO-call with Osmux enable on 3GPP AoIP
msc {
	hscale=2;
	ms [label="MS"], bts [label="OsmoBTS"], bsc[label="OsmoBSC"], mgw_bsc[label="OsmoMGW(bsc)"], m_sc[label="MSC"], mgw_msc[label="OsmoMGW(msc)"];

	bsc <- m_sc 	[label="BSSMAP RESET (with extension IE: Osmux Support)"];
	bsc -> m_sc 	[label="BSSMAP RESET ACK (with extension IE: Osmux Support)"];
	...;
	ms box mgw_msc	[label="We assume a SDCCH is already established"];
	...;

	ms -> bsc	[label="DTAP CM Service Request"];
	bsc -> m_sc	[label="Complete Layer 3 Information DTAP CM Service Request"];

	# Allocate MGW/MSC Osmux endpoint
	m_sc -> mgw_msc	[label="MGCP CRCX rtpbridge/*@mgw, X-Osmux: *"];
	mgw_msc box mgw_msc	[label="Bind to MGW-local Osmux Port (1984)\nAllocate new endpoint 1, MGW's local CID 5"];
	mgw_msc -> m_sc	[label="MGCP CRCX rtpbridge/1@mgw OK (MGW:1984, X-Osmux: 5)"];

	bsc <- m_sc 	[label="BSSAP ASSGN REQ (3GPP AoIP, extension IE: Osmux CID 5)"];
	bts <- bsc 	[label="RSL CHAN ACT"];
	bts -> bsc 	[label="RSL CHAN ACT ACK"];
	ms <- bsc      [label="Assignment Command"];
	ms -> bsc      [label="Assignment Complete"];
	...;

	# connect BTS RTP with BSC-MGW RTP
	bts <- bsc	[label="IPA CRCX"];
	bts box bts	[label="Bind to BTS-local RTP Port (1000)"];
	bts -> bsc	[label="IPA CRCX ACK (BTS:1000)"];
	bsc -> mgw_bsc	[label="MGCP CRCX rtpbridge/2@mgw (BTS:1000)"];
	mgw_bsc box mgw_bsc	[label="Bind to MGW-local RTP Port (2000)\nConnect to BTS:1000"];
	bsc <- mgw_bsc	[label="MGCP CRCX rtpbridge/2@mgw OK (MGW:2000)"];
	bts <- bsc	[label="IPA MDCX (MGW:2000)"];
	bts box bts	[label="Connect RTP socket to remote (MGW) RTP Port"];
	bts -> bsc	[label="IPA MDCX ACK"];
	...;

	mgw_bsc <- bsc	[label="MGCP CRCX rtpbridge/2@mgw (MSC:1984, X-Osmux: 5)"];
	mgw_bsc box mgw_bsc	[label="Bind to MGW-local Osmux Port (1985)\nConnect to MSC:1984\nAllocate new MGW's local CID 7"];
	mgw_bsc -> bsc	[label="MGCP CRCX rtpbridge/2@mgw OK (MGW:1985, X-Osmux: 7)"];
	...;

	bsc -> m_sc	[label="BSSAP ASSGN CMPL (3GPP AoIP MGW:1985, extension IE: Osmux CID 7)"];
	m_sc box m_sc	[label="Connect remote Osmux to MGW addr from ASSGN CMPL"];
	m_sc -> mgw_msc	[label="MGCP MDCX rtpbridge/1@mgw (MGW:1985, X-Osmux: 7)"];
	m_sc <- mgw_msc	[label="MGCP MDCX rtpbridge/1@mgw OK (X-Osmux: 5)"];
	...;

	mgw_bsc <=> mgw_msc	[label="Osmux Audio MGW:1985 MSC:1984, CID(uplink):5, CID(downlink):7"];
	bts <=> mgw_bsc	[label="RTP Audio BTS:1000 MGW:2000"];
	ms <=> bts	[label="Um Audio (bidirectional)"];
	ms <-> m_sc	[label="DTAP CC ALERTING"];
}