CISSP Exam 2025 – 400 Free Practice Questions to Pass the Exam

The Session Initiation Protocol (SIP) primarily focuses on the establishment, management, and termination of multimedia communication sessions such as voice calls, video conferencing, and messaging. SIP facilitates the signaling needed to initiate and control these communications over the internet, meaning it is essential in VoIP (Voice over Internet Protocol) services.

This protocol allows users to set up sessions with others, negotiate the parameters of those sessions, and ensures that the communication can be maintained or terminated when needed. Given its central role in managing multimedia interactions, it is best articulated as being primarily concerned with multimedia communication sessions.

The other options describe functionalities that are not under the purview of SIP. For instance, file transfer involves specific protocols such as FTP (File Transfer Protocol) rather than SIP. Secure email transmission refers to protocols like S/MIME or PGP, which focus on email security rather than session management. Lastly, routing internet traffic typically involves networking protocols like BGP (Border Gateway Protocol) or OSPF (Open Shortest Path First) rather than SIP, which is specifically intended for session management.