- Session Initiation Protocol (SIP)
- FAQs, background materials and lists of current work in this field.
- FirstHand Technologies - Client and server software developer for service providers and telecom equipment vendors, to address enterprise mobility markets.
- IETF SIP Charter - Working group for protocol development. Links to RFC's and internet drafts.
- PROTOS Test Suite - A test-suite to find vulnerabilities in protocol software.
- pulver.com - A collection of information on the protocol. Contains news, reports and an IP telephony job noticeboard.
- The SIP Center - Portal with technical and market resources aimed at commercial developers. Also provides a testbed area for software and proxy development.
- SIP411 Directory Services - A Yellow Pages style directory of SIP addresses.
- SIP Forum - A membership based forum. Also contains a news board.
- SIP Made Easy - An introductory tutorial talks about protocol functions, components, message types, how it works and where it is applied.
- SIP Wiki - Wiki based resource containing information and links.
- SIPfoundry - An international open source community providing VoIP solutions and technology based on the SIP standard.
- Soft Front - Provides a software development environment.
- Tech Invite - Portal containing links to technical information and RFC documentation.
- Vidosystem - Produces softphones. Site has downloads section and information on protocols supported.
- Voice System - Design, consultancy and development for SIP Express Router (SER) servers.
- VoIP User - Consumer guide and forum. Also has software phone downloads and links to service providers.
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