Question: What type of number does the 'Service Centre Address' field contain to identify a specific service centre like an SMS centre?
Option 1: ITU-T E.164 number
Option 2: IP address (either IPv4 or IPv6)
Option 3: MAC (Media Access Control) address
Option 4: URI (Uniform Resource Identifier)
Explanation: The correct answer is ITU-T E.164 number because this standard specifies the format for international telephone numbers, which can be used to uniquely identify service centers, such as those for SMS services, within the global telecommunications network.