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. However, SIP-based communication does not reach users on the local area network (LAN) behind firewalls and Network Address Translation (NAT) routers automatically.

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