Question: In the context of the S15 Application for Policy and Charging Control (PCC), how are S15 Messages typically carried, and what identifier is crucial for inclusion in a specific AVP during session establishment?
Option 1: Over SSH, with the Session-Id included in the User-Name AVP.
Option 2: Within Diameter Application(s), with the S15 application identifier included in the Auth-Application-Id AVP.
Option 3: Through HTTP, requiring the inclusion of the S15 application identifier in the Host AVP.
Option 4: Via FTP, with the Session-Timeout included in the Acct-Application-Id AVP.
Explanation: This is correct because, according to specifications for the S15 Application in Policy and Charging Control (PCC), messages are carried within Diameter Application(s). The S15 application identifier must be included in the Auth-Application-Id AVP for proper identification and session establishment, ensuring each established diameter session corresponds to an S15 session.