» Session Initiation Protocol (SIP) FAQs, background materials and lists of current work in this field. http://www.cs.columbia.edu/sip/
» Brekeke Software Products for small to medium sized offices and a server database. http://www.brekeke.com/
» FirstHand Technologies Client and server software developer for service providers and telecom equipment vendors, to address enterprise mobility markets. http://www.firsthandtech.com/
» IETF SIP Charter Working group for protocol development. Links to RFC's and internet drafts. http://www.ietf.org/html.charters/sip-charter.html
» PROTOS Test Suite A test-suite to find vulnerabilities in protocol software. http://www.ee.oulu.fi/research/ouspg/protos/testing/c07/sip/
» SIP Forum A membership based forum. Also contains a news board. http://www.sipforum.org/
» SIP Made Easy An introductory tutorial talks about protocol functions, components, message types, how it works and where it is applied. http://geocities.com/intro_to_multimedia/SIP/
» SIP Wiki Wiki based resource containing information and links. http://www.toyz.org/cgi-bin/sipwiki.cgi
» SIPfoundry An international open source community providing VoIP solutions and technology based on the SIP standard. http://www.sipfoundry.org/
» Soft Front Provides a software development environment. http://www.softfront.co.jp/en/
» Tech Invite Portal containing links to technical information and RFC documentation. http://www.tech-invite.com
» The SIP Center Portal with technical and market resources aimed at commercial developers. Also provides a testbed area for software and proxy development. http://www.sipcenter.com/
» Vidosystem Produces softphones. Site has downloads section and information on protocols supported. http://www.vidosystem.com
» VoIP User Consumer guide and forum. Also has software phone downloads and links to service providers. http://www.voipuser.org
» Voice System Design, consultancy and development for SIP Express Router (SER) servers. http://www.voice-sistem.ro
» pulver.com A collection of information on the protocol. Contains news, reports and an IP telephony job noticeboard. http://www.pulver.com/
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