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Session Initiation Protocol (SIP) represents the third wave of Internet usage after SMTP (email) and HTTP (Web). Developed by the Internet Engineering Task Force (IETF), SIP has today become the signaling protocol of choice for establishing realtime communications, including Voice over IP (VoIP) calls. Research suggests that SIP is the VoIP protocol that has replaced H.323 and MGCP and that, for the foreseeable future, no replacement is expected. However, SIP-based communication does not reach users on the Local Area Network (LAN) behind firewalls and Network Address Translation (NAT) routers automatically. Firewalls are designed to prevent inbound unknown communications and NAT stops users on a LAN from being addressed.

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Format:PDFSize:274 KB
Date:May 2007
Pages:12

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