What is the role of the Session Initiated Protocol (SIP)?

The Session Initiation Protocol (SIP) is primarily designed to establish, modify, and terminate multimedia communication sessions over the Internet. This includes voice calls, video conferencing, and other real-time communication forms. By handling the signaling necessary to initiate and manage these sessions, SIP plays a crucial role in facilitating communication between endpoints, such as telephones, computers, and other devices.

SIP's capabilities extend beyond simply starting a session; it also allows for the modification of existing sessions, such as adjusting the media parameters or adding participants. Furthermore, it can terminate sessions gracefully when communication is finished. This functionality is essential for any communication system that seeks to be flexible and responsive to user needs. Thus, this makes the choice regarding its role in managing media stream sessions the correct choice.