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msc {
hscale = "3";
ue,hnb,hnbgw,cn;
ue box hnb [ label = "Radio Channel Establishment" ];
ue => hnb [ label = "RRC (MM LOC UPD REQ)" ] ;
hnb => hnbgw [ label = "RUA CONNECT (RANAP Initial UE Msg (CM SERV REQ))" ];
hnbgw => cn [ label = "SCCP CR (RANAP Initial UE Msg (CM SERV REQ))" ];
cn >> hnbgw [ label = "SCCP CC" ];
--- [ label = "Optional retrieval of IMSI (if not given in CM or retrived from VLR by TMSI)" ];
cn => hnbgw [ label = "SCCP DT1 (RANAP DirectTransfer (MM IDENTITY REQ))" ];
hnbgw => hnb [ label = "RUA DT (RANAP DirectTransfer (MM IDENTITY REQ))" ];
hnb => ue [ label = "RRC (MM IDENTITY REQ)" ];
ue >> hnb [ label = "RRC (MM IDENTITY RESP)" ];
hnb >> hnbgw [ label = "RUA DT (RANAP DirectTransfer (MM IDENTITY RESP))" ];
hnbgw >> cn [ label = "SCCP DT1 (RANAP DirectTransfer (MM IDENTITY RESP))" ];
--- [ label = "Mandatory activation of Integrity Protection" ];
cn => hnbgw [ label = "SCCP DT1 (RANAP SecurityModeCommand (IK))" ];
hnbgw => hnb [ label = "RUA DT (RANAP SecurityModeCommand (IK))" ];
hnb >> hnbgw [ label = "RUA DT (RANAP SecurityModeResponse (IK))" ];
hnbgw >> cn [ label = "SCCP DT1 (RANAP SecurityModeResponse (IK))" ];
cn => hnbgw [ label = "SCCP DT1 (RANAP CommonID)" ];
hnbgw => hnb [ label = "RUA DT (RANAP CommonID)" ];
--- [ label = "Optional Authentication" ];
cn => hnbgw [ label = "SCCP DT1 (RANAP DirectTransfer (MM AUTH REQ))" ];
hnbgw => hnb [ label = "RUA DT (RANAP DirectTransfer (MM AUTH REQ))" ];
hnb => ue [ label = "RRC (MM AUTH REQ)" ];
ue >> hnb [ label = "RRC (MM AUTH RESP)" ];
hnb >> hnbgw [ label = "RUA DT (RANAP DirectTransfer (MM AUTH RESP))" ];
hnbgw >> cn [ label = "SCCP DT1 (RANAP DirectTransfer (MM AUTH RESP))" ];
--- [ label = "Optional activation of Encryption" ];
cn => hnbgw [ label = "SCCP DT1 (RANAP SecurityModeCommand (IK+CK))" ];
hnbgw => hnb [ label = "RUA DT (RANAP SecurityModeCommand (IK+CK))" ];
hnb >> hnbgw [ label = "RUA DT (RANAP SecurityModeResponse (IK+CK))" ];
hnbgw >> cn [ label = "SCCP DT1 (RANAP SecurityModeResponse (IK+CK))" ];
cn >> hnbgw [ label = "SCCP DT1 (RANAP DirectTransfer (CM SERV ACC))" ];
hnbgw >> hnb [ label = "RUA DT (RANAP DirectTransfer (CM SERV ACC))" ];
hnb >> ue [ label = "RRC (CM SERV ACC)" ];
ue box ue [ label = "subscriber A dials a call" ];
ue => hnb [ label = "RRC (CC SETUP)" ];
hnb => hnbgw [ label = "RUA DT (RANAP DirectTransfer (CC SETUP))" ];
hnbgw => cn [ label = "SCCP DT1 (RANAP DirectTransfer (CC SETUP))" ];
cn box cn [ label = "Signalling towards B subscriber via ISUP, SIP, ..." ];
cn => hnbgw [ label = "SCCP DT1 (RANAP DirectTransfer (CC ALERTING))" ];
hnbgw => hnb [ label = "RUA DT (RANAP DirectTransfer (CC ALERTING))" ];
hnb => ue [ label = "RC (CC ALERTING)" ];
--- [ label = "Assignment of Voice Channel" ];
cn => hnbgw [ label = "SCCP DT1 (RANAP RAB Assign Cmd)" ];
hnbgw => hnb [ label = "RUA DT (RANAP RAB Assign Cmd)" ];
hnb >> hnbgw [ label = "RUA DT (RANAP RAB Assign Rsp)" ];
hnbgw >> cn [ label = "SCCP DT1 (RANAP RAB Assign Rsp)" ];
cn box cn [ label = "subscriber B picks up the ringing call" ];
cn => hnbgw [ label = "SCCP DT1 (RANAP DirectTransfer (CC CALL CONF))" ];
hnbgw => hnb [ label = "RUA DT (RANAP DirectTransfer (CC CALL CONF))" ];
hnb => ue [ label = "RRC (CC CALL CONF)" ];
cn box ue [ label = "Voice channel open" ];
ue box ue [ label = "subscriber A hangs up" ];
ue => hnb [ label = "RRC (CC DISCONNECT)" ];
hnb => hnbgw [ label = "RUA DT (RANAP DirectTranfer (CC DISCONNECT))" ];
hnbgw => cn [ label = "SCCP DT1 (RANAP DirectTranfer (CC DISCONNECT))" ];
cn box hnb [ label = "RAB Release or Iu Release" ];
}
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