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msc {
hscale = 2;
ms [label="MS"], bts [label="BTS"], bsc [label="BSC"], Msc [label="MSC"], mgw [label="MGW"];
ms => bts [label="L1 RACH burst"];
bts => bsc [label="RSL CHAN RQD"];
bts <= bsc [label="RSL CHAN ACT"];
bts => bsc [label="RSL CHAN ACT ACK"];
bts <= bsc [label="RSL IMM ASS CMD (RR IMM ASS)"];
ms <= bts [label="RR IMMEDIATE ASSIGN"];
ms => bts [label="LAPDm SABM (CM SERVICE REQ)"];
ms <= bts [label="LAPDm FIXME"];
bts => bsc [label="RSL ESTABLISH IND (CM SERVICE REQ)"];
bsc => Msc [label="CR (BSSAP COMPLETE L3 (CM SERVICE REQ))"];
...;
ms box Msc [label="MM Common Procedures (INFO, ID, AUTH, CIPH)"];
...;
ms => bts [label="CC SETUP"];
bts => bsc [label="RSL DATA IND (CC SETUP)"];
bsc => Msc [label="DT1 (DTAP (CC SETUP))"];
...;
ms box Msc [label="CC Signalling"];
...;
bsc <= Msc [label="BSSAP ASSIGNMENT CMD (TCH)"];
bts <= bsc [label="RSL IPA CRCX", id="1"];
bts => bsc [label="RSL IPA CRCX ACK (IP/Port @ BTS)"];
bsc => Msc [label="FIXME"];
Msc => mgw [label="FIXME"];
bts <- mgw [label="Start RTP + RTCP UDP Flows"];
bts <= bsc [label="RSL DATA REQ (RR CHAN MOD MODIFY)"];
ms <= bts [label="RR CHAN MOD MODIFY"];
ms => bts [label="RR CHAN MOD MODIFY ACK"];
bts => bsc [label="RSL DATA IND (RR CHAN MOD MODIFY ACK)"];
|||;
bts <= bsc [label="RSL MODE MODIFY REQ"];
bts => bsc [label="RSL MODE MODIFY ACK"];
Msc <= mgw [label="FIXME"];
bsc <= Msc [label="FIXME"];
bts <= bsc [label="RSL IPA MDCX (IP/Port @ MGW)", id="2"];
bts => bsc [label="RSL IPA MDCX ACK"];
bts -> mgw [label="Start RTP + RTCP UDP Flows"];
ms box mgw [label="Active Voice Call"];
bts => bsc [label="RSL MEAS RES"];
...;
bts <= bsc [label="RSL IPA DLCX"];
bts => bsc [label="RSL IPA DLCX ACK"];
bts -x mgw [label="Stop RTP + RTCP UDP Flows"];
bts <= bsc [label="RSL RF CHAN REL"];
bts => bsc [label="RSL RF CHAN REL ACK"];
}
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