Question: In a 3GPP IP-based service, when using TLS for signaling information between the UE (User Equipment) and the P-CSCF (Proxy-Call Session Control Function), who decides which TLS CipherSuites are utilized for the session?
Option 1: The UE (User Equipment) selects from its offered list.
Option 2: Both the UE and P-CSCF mutually agree on the selection.
Option 3: The decision is based on a predefined network policy.
Option 4: The P-CSCF decides which TLS CipherSuites are used.
Explanation: This question tests understanding of access security in IP-based services. After the UE offers TLS CipherSuites, the P-CSCF chooses which ones will be utilized for the session, ensuring flexibility and security at the network's edge, highlighting the P-CSCF's role in managing and securing the signaling path.