The SIP protocol was designed with the Internet in mind. With its request-response model, it resembles HTTP and other Internet protocols. As a result, telephony simply becomes another web application that can be integrated into other applications and services easily. Compared to legacy mobile-network protocols, SIP is easy to program to, so it will become an important tool for establishing communication sessions. It can be used to implement all kinds of peer-to-peer applications that feature voice, video, messaging, and gaming.
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