Session Initiation Protocol (SIP) is a signaling protocol that is used to create, modify, and end media streams containing text messaging, voice, and video.

SIP provides a standard means to establish sessions, negotiate capabilities, invoke applications, and exchange data with Avaya Aura® MS. The SIP protocol is an application layer protocol designed to be independent of the underlying transport layer. Avaya Aura® MS supports SIP on Transmission Control Protocol (TCP), User Datagram Protocol (UDP), and Transport Layer Security (TLS).