add SGs / CSFB related dot + msc files
Those graphs + message sequence charts are not yet used by any
of our manuals, but they should become used by the OsmoMSC user
manual once SGs interface support is added.
Related: OS#2583
Change-Id: Idfd3a66c18131b5458d183b8e66f62eaaab65991
diff --git a/doc/manuals/images/sgs-mo_call_no_ps_ho.msc b/doc/manuals/images/sgs-mo_call_no_ps_ho.msc
new file mode 100644
index 0000000..f886c89
--- /dev/null
+++ b/doc/manuals/images/sgs-mo_call_no_ps_ho.msc
@@ -0,0 +1,18 @@
+msc {
+ hscale=2;
+ UE, ENB [label="eNodeB"], BSS, MME, VLR [label="MSC/VLR"], HSS [label="HSS/HLR"];
+
+ UE => MME [label="NAS Extended Service Request"];
+ ENB <= MME [label="S1-AP UE Context Mod Req with CSFB"];
+ ENB => MME [label="S1-AP UE Context Mod Resp"];
+ UE <= ENB [label="NACC (Network Assisted Cell Change)"];
+ ENB => MME [label="S1-AP S1 UE Context Release Req"];
+ UE box MME [label="S1 UE Context Release"];
+
+ UE box HSS [label="UE changes RAT then LA and/or RA update"];
+ UE <=> HSS [label="PS Suspend (TS 23.060)"];
+
+ UE => BSS [label="CM SERV REQ"];
+ BSS => VLR [label="COMPL L3 (CM SERV REQ)"];
+ UE <=> VLR [label="Normal 2G Voice Call"];
+}