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PJNATH (PJSIP NAT Helper) is an open source library providing NAT traversal functionalities by using standard based protocols such as STUN, TURN, and ICE. Background Network Address Translation (NAT) is commonly deployed everywhere primarily to alleviate the exhaustion of IPv4 address space by allowing multiple hosts to share a public/Internet address. While NAT would work well for typical client

PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. It combines signaling protocol (SIP) with rich multimedia framework and NAT traversal functionality into high level API that is portable and suitable for almost any type of systems ranging from desktops, embedded systems, to mobile