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Session Initiation Protocol (SIP)
FAQs, background materials and lists of current work in this field. (infos)The SIP Center
Portal with technical and market resources aimed at commercial developers. Also provides a testbed area for software and proxy development. (infos)
pulver.com
A collection of information on the protocol. Contains news, reports and an IP telephony job noticeboard. (infos)
Sipcall
A UK based service provider. Also contains hardware related links and protocol white-papers. (infos)
Soft Front
Provides a development environment for software centered around SIP/VoIP technology. (infos)
SIP Forum
A membership based forum. Also contains a news board. (infos)
PROTOS Test Suite
A test-suite to find vulnerabilities in protocol software. (infos)
SIPquest Inc.
Software component developer for service providers and telecom equipment vendors. (infos)
Brekeke Software
Products for small to medium sized offices and a server database. (infos)
Parrish Systems
Sells off the shelf code and provides a software consultancy service. (infos)