How old is sip protocol

A protocol is a set of rules that defines how two or more computing devices laptops, smartphones, routers, network switches, etc. Systems that enable the transmission of voice and video calls through internet networks are known as VoIP or business phone systems. SIP is an application layer protocol and the foundation of modern interactive communications over the internet voice calls, video calls, etc.

SIP simply initiates and terminates an IP communication session, which could be a voice call between two people or a video conference between a team. It sets up the session by sending messages—in the form of data packets—between two or more identified IP endpoints, also known as SIP addresses. The image below depicts the initiation details of an SIP session. An SIP invite message Source. Several other protocols work along with it to ensure voice data reaches its destination. The session description protocol SDP is one such protocol.

While SIP communicates with IP endpoints to exchange signaling details, SDP conveys session-related information to help participants join or receive details of the session. The messages are text-based, and the request-response mechanism makes for easier troubleshooting. The SIP messages describe the identity of the participants in a call, and how the participants can be reached over an IP network. SDP Session Description Protocol will define the type of media channels that will be established for the session — typically this will declare which codecs are available, and how the media engines can reach each other over an IP network.

Once this exchange of setup messages is completed, the media is exchanged using yet another protocol, typically RTP Real-Time Transmission Protocol. RFC SIP trunking explained. What is SIP? VoIP is a family of technologies that all support sending or receiving voice messages over the internet. SIP is an application protocol used to carry all forms of digital media, including voice messages—so SIP is a specific technology that supports VoIP calls.

What is an SIP trunk or trunking? Read the Blog. The uses for such sessions include voice, video, chat and instant messaging, as well as interactive games and virtual reality. SIP can be used to control Internet multimedia conferences, Internet telephone calls and multimedia distribution, in both the core and the periphery of the communications network.

To address the requirements of carrier-grade equipment manufacturers for SIP protocol software with high reliability, performance and scalability, Metaswitch has developed DC-SIP, a robust, high-function, flexible and portable SIP software implementation.

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