Web Directory

» FirstHand Technologies
   Client and server software developer for service providers and telecom equipment vendors, to address enterprise mobility markets.
   http://www.firsthandtech.com/

» PROTOS Test Suite
   A test-suite to find vulnerabilities in protocol software.
   http://www.ee.oulu.fi/research/ouspg/protos/testing/c07/sip/

» SIP (Session Initiation Protocol) Introduction
   An introductory tutorial talks about protocol functions, components, message types, how it works and where it is applied.
   http://www.siptutorial.net/SIP/

» SIP Forum
   A membership based forum. Also contains a news board.
   http://www.sipforum.org/

» 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/

» 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/