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Session Initiation Protocol (SIP) is the Internet Engineering Task Force's (IETF's) standard for multimedia conferences over IP. SIP is an ASCII-based, application-layer control protocol (defined in RFC 2543) that can be used to establish, maintain, and terminate calls between two or more end points. Like other VoIP protocols, SIP is designed to address the functions of signaling and session management within a packet telephony network. Signaling allows call information to be carried across network boundaries. Session management provides the ability to control the attributes of an end-to-end call whereby a IMG 2020 can be used as a Media Gateway to allow two separate networks to connect. The IMG 2020 supports messaging between SS7 and SIP, and ISDN and SIP. Transcoding from SIP to SIP is also supported. Below is typical diagram of the IMG 2020 in a TDM to IP network.
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