Question: In a User Equipment (UE) initiating an originated call, what is the correct sequential order of MMI (Man-Machine Interface) functions as per 3GPP standards for successful call setup and termination?
Option 1: SELECT → SEND → INDICATION → END
Option 2: SEND → SELECT → END → INDICATION
Option 3: INDICATION → SELECT → SEND → END
Option 4: END → INDICATION → SELECT → SEND
Explanation: The correct sequence is crucial for a successful call setup and termination. SELECT (Entry of called address information) logically comes first, as the user needs to input the number. SEND (Transmission of the called address) follows, as the entered address needs to be sent over the network. INDICATION (Call progress indications) is next, providing feedback on the call’s status (e.g., ringing, connected). Finally, END (Termination of the call) concludes the sequence, allowing the user to hang up. This order aligns with intuitive user experience and technical necessity in telecom networks.