Siproxd is a proxy/masquerading daemon for the SIP protocol. It handles registrations of SIP clients on a private IP network and performs rewriting of the SIP message bodies to make SIP connections work via an masquerading firewall (NAT).It allows SIP software clients (like linphone, kphone) or SIP hardware clients (Voice over IP phones which are SIP-compatible, such as those from Cisco, Snomor Grandstream) to work behind an NAT router or an IP masquerading firewall.SIP (Session Initiation Protocol, RFC3261) is the protocol of choice for most VoIP (Voice over IP) phones to initiate communication. By itself, SIP does not work via masquerading firewalls as the transfered data contains IP addresses and port numbers. There do exist other solutions to traverse NAT existing (like STUN, or SIP aware NAT routers), but such solutions have their disadvantages or may not be applied to a given situation. Siproxd does not aim to be a replacement for these solutions, however in some situations siproxd may bring advantages.Siproxd runs on a variety of Unix derivates. Currently known to work are:· Mac OS X· Linux· FreeBSD· OpenBSD· SunOSRequirements: