The Session Initiation Protocol (SIP) is a signaling protocol used for initiating, sustaining, and terminating real-time communication classes. It’s extensively used for voice and video over IP (VoIP) functions, instantaneous 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 applicable responses. SIP messages are sometimes despatched over UDP, however will also be despatched over TCP.