Question: In SMS according to 3GPP standards, what does Octet 1 represent in the Information-Element-Data for a Predefined Sound?
Option 1: The total duration of the predefined sound in seconds.
Option 2: A flag indicating whether the sound is played before or after the message.
Option 3: The sound number selected from a predefined list.
Option 4: The position in the SM data after which the predefined sound shall be played, counted from the beginning of the message.
Explanation: This is correct because Octet 1 indicates the instant after which the sound shall be played, measured by the number of characters from the start of the SM data, ensuring synchronization between text display and audio playback in an SMS.