title MT CSFB-UTRAN-Cell Redirection
participant UE
participant SS
SS->UE: IP Packet
SS->UE: CS SERVICE NOTIFICATION
UE->SS: EXTENDED SERVICE REQUEST
SS->UE: RRC CONNECTION RELEASE
UE->SS: UTRAN: RRC CONNECTION REQUEST
SS->UE: RRC CONNECTION SETUP
UE->SS: RRC CONNECTION SETUP COMPLETE
UE->SS: ROUTING AREA UPDATE REQUEST
UE->SS: PAGING RESPONSE
SS->UE: AUTHENTICATION REQUEST
UE->SS: AUTHENTICATION RESPONSE
SS->UE: SECURITY MODE COMMAND
UE->SS: SECURITY MODE COMPLETE
SS->UE: SETUP
UE->SS: CALL CONFIRMED
SS->UE: RADIO BEARER SETUP
UE->SS: RADIO BEARER SETUP COMPLETE
UE->SS: ALERTING
SS->UE: CONNECT
UE->SS: CONNECT ACKNOWLEDGE
SS->UE: PS DOMAIN: SECURITY MODE COMMAND
UE->SS: SECURITY MODE COMPLETE
SS->UE: ROUTING AREA UPDATE ACCEPT
UE->SS: ROUTING AREA UPDATE COMPLETE