Question: For an N5GC device or AUN3 device connecting via CRG to a 5GS network, what form does the SUPI (Subscription Permanent Identifier) take according to 3GPP specifications?
Option 1: IMSI (International Mobile Subscriber Identity)
Option 2: MSISDN (Mobile Station International Subscriber Directory Number)
Option 3: NAI (Network Access Identifier)
Option 4: GUTI (Globally Unique Temporary Identifier)
Explanation: The SUPI for non-5G capable devices or AUN3 devices, when connecting via CRG to a 5GS network, incorporates a network-specific identifier. According to the specifications, this results in the SUPI taking the form of a Network Access Identifier (NAI), ensuring compatibility and secure access within the 5G System architecture.