Question: Which of the following services is NOT allowed to utilize Local Call Local Switch (LCLS) functionality, according to 3GPP specifications?
Option 1: Subscriber and Equipment Trace
Option 2: Emergency Calls
Option 3: Global Text Telephony
Option 4: Audio Conference Calls
Explanation: According to the 3GPP specification, Local Call Local Switch (LCLS) is explicitly not allowed for Global Text Telephony. This restriction ensures that Global Text Telephony services maintain their intended global reach and functionality without being confined to local switching limitations.