Question: In a concatenated SMS, where should the UDH Source Indicator (IEI) and its associated data be primarily contained to avoid processing difficulties at the receiving entity?
Option 1: Only in the last segment of the concatenated SMS
Option 2: Primarily in the first segment of the concatenated SMS, with repetition in subsequent segments recommended for robustness
Option 3: In any segment of the concatenated SMS, as the order does not affect processing
Option 4: Exclusively in every subsequent segment after the first, to ensure accurate message assembly
Explanation: To maintain integrity and avoid potential processing issues (e.g., out of sequence delivery or missing first segment), the UDH Source Indicator and its data should be contained primarily in the first segment of a concatenated SMS. While not mandatory, including this information in every subsequent segment enhances robustness against delivery anomalies, aligning with best practices for reliable message handling in telecom networks.