Question: What happens to supplementary services at the terminating party when a core network identifies an incoming call as a call-back to an emergency call from a PSAP (Public Safety Answering Point)?
Option 1: They are handled according to Multimedia Telephony service rules, allowing for services like Communication Diversion, Hold, and Barring.
Option 2: All supplementary services are automatically disabled to prioritize the call-back connection.
Option 3: The handling of supplementary services is determined by the originating terminal's capabilities.
Option 4: The core network ignores supplementary services for call-backs, treating them as standard voice calls.
Explanation: According to telecom principles for emergency services, when a core network identifies an incoming call as a call-back from a PSAP, it handles supplementary services in a manner that ensures uninterrupted communication. This is achieved by following rules similar to those for Multimedia Telephony, which includes managing services like Communication Diversion, Hold, and Barring, thereby ensuring the call-back reaches the intended terminal efficiently.