The Session Initiation Protocol (SIP) is a signaling protocol used for initiating, sustaining, and terminating real-time communication periods. It’s extensively used for voice and video over IP (VoIP) purposes, on the spot messaging, and different multimedia communications.
SIP is a text-based protocol that makes use of a client-server mannequin. The SIP consumer sends requests to the SIP server, which then responds with acceptable responses. SIP messages are usually despatched over UDP, however can be despatched over TCP.