1. Request to Core System_Request message by Client; 2. Request to Other State_Request message by Core System of this State; 3. Request to Core System of this State_Request message by Core System of other State; 4. Request to Legacy Register_Request message by Core System; 5. Request to Core System_Request message by Legacy Register; 6. Response from Core System_Request message by Client; 7. Response from Other State_Request message by Core System of this State;