SIP – Session Initiation Protocol
SIP can be described as a signalling protocol that is used for controlling communication sessions over Internet Protocol (IP). Examples of the types of communications sessions controlled by SIP include voice and video calls, instant messaging, and online games. The SIP protocol can be used for creating, terminating, and modifying sessions that can consist of several media streams. SIP is a enabling technology, which allows organisation to take advantage of a hugely diverse set of communications tools and applications. SIP is considered by many industry professionals as the future of network communications.