What is SIP?

Session Initiation Protocol

This is a signaling protocol used for establishing sessions in an IP network. SIP will assist you in attributing advance telephony services across the Internet. Internet telephony is evolving from its use as an “inexpensive” (but contemptible quality) way to make international phone calls to a serious business telephony capability. SIP sessions can include voice communications, instant messaging, and multimedia applications.

SIP is justified as a control protocol for creating, modifying and terminating session’s with one or more participants. These sessions include Internet multimedia conferences, Internet (or any IP Network) telephone calls and multimedia distribution. Members in a session can communicate via multicast or via a mesh of uncast relations, or via a combination of these.

SIP anticipates on a peer to peer architecture that uses intelligent network elements for advanced call processing and call management functions. These endpoints are accredited to as the user agent client and the user agent server. A proxy server can be used as an intermediary responsible for exchanging the request from the client to the SIP server. SIP proxy servers can provide advanced call processing functions including security, authentication, and call routing. Real-time Transport protocol (RTP) is used to carry the voice or video content at the application layer between SIP endpoints.

The commands that SIP uses are called methods. SIP defines the following methods:


Invites a user to a call


Used to facilitate reliable message exchange for INVITES


Terminates a connection between users or declines a call


Terminates a request, or search, for a user


Registers a user’s current location


Solicits information about a server’s capabilities


Used for mid-session signaling

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