How does SIP contribute to Internet Telephony?

SIP, which stands for Session Initiation Protocol, is a signaling protocol that is fundamental to Internet telephony because it enables the establishment, management, and termination of real-time communication sessions over the Internet. This includes voice calls, video calls, and messaging, allowing users to communicate with each other in real-time regardless of their geographical location.

The ability to manage multimedia sessions means that SIP can initiate calls, modify them mid-session, and terminate them when the communication is complete. By using SIP, various types of communication can take place seamlessly over IP networks, making it a cornerstone technology for Voice over IP (VoIP) services. This capability directly supports internet telephony, which relies on real-time interactions between users.

Other options either pertain to different types of communication technologies, such as file sharing and email messaging systems, or are not primarily related to SIP’s purpose, such as enhancing video gaming experiences. Therefore, the primary contribution of SIP to Internet telephony is its role in enabling real-time communication, making the selected answer accurate.