The SIP features can be thought of as building blocks for any SIP-AS functionality, regardless of whether it is MMTel-AS, SCC-AS or any other SIP-AS.
The General VoLTE Features are used by both the MMTel-AS and SCC-AS functionality of the Sentinel VoLTE product. They can be thought of as building blocks for MMTel-AS and SCC-AS.
The MMTel Features implement MMTel-AS functionality.
The SCC Features implement SCC-AS functionality.
The Third Party Registration features implement the necessary Third Party Registration functionality for the MMTel-AS and SCC-AS.
The CAMEL features can be thought of as building blocks for SCP functionality.