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# MO Call on a classic E1 Abis BTS with classic E1 A BSC
# not actually supported by OsmoBSC (nor planned), for refrence only
msc {
hscale=2;
ms [label="MS"], bts [label="E1 BTS"], bsc[label="OsmoBSC"], trau[label="TRAU"], 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"];
bsc <- m_sc [label="BSSAP ASSGN REQ"];
bsc box m_sc [label="E1 TS for PCM specified by CIC"];
bts <- bsc [label="RSL CHAN ACT"];
bts -> bsc [label="RSL CHAN ACT ACK"];
bts box bsc [label="E1 TS + 16k sub-slot configured for given lchan"];
ms <-> bsc [label="Assignment"];
bsc -> m_sc [label="BSSAP ASSGN CMPL"];
...;
trau <- m_sc [label="PCM Audio in full E1 slot"];
bts <- trau [label="A-bis TRAU frames on 16k sub-slot"];
...;
ms <- m_sc [label="DTAP CC CONNECT"];
ms -> m_sc [label="DTAP CC CONNECT ACK"];
trau <-> m_sc [label="PCM Audio in full E1 slot"];
bts <-> trau [label="A-bis TRAU frames on 16k sub-slot"];
--- [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"];
}
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