Call Flow Messages:
participant UE
participant Utran
UE->Utran: RRC Connection Request/ RRC
Utran->UE: RRC Connection Setup/ RRC
UE->Utran: RRC Connection Setup Complete/ RRC
UE->Utran: CM Service Request/ MM
Utran->UE: Identity Request/ MM
UE->Utran: Identity Response/ MM
Utran->UE: Authentication Request/ MM
UE->Utran: Authentication Response/ MM
Utran->UE: Security Mode Command/ RRC
UE->Utran: Security Mode Complete/ RRC
UE->Utran: Setup MO/ CC
Utran->UE: Radio Bearer Setup/ RRC
UE->Utran: Radio Bearer Setup Complete/ RRC
Utran->UE: Call Proceeding/ CC
Utran->UE: Alerting/ CC
Utran->UE: Connect/ CC
UE->Utran: Connect Ack/ CC
UE->Utran: Disconnect/ CC
Utran->UE: Release/ CC
UE->Utran: Release Complete/ CC
Utran->UE: Radio Bearer Release/ RRC
UE->Utran: Radio Bearer Release Complete/ RRC
Utran->UE: RRC Connection Release/ RRC
UE->Utran: RRC Connection Release Complete/ RRC