- Session Initiation Protocol (SIP) - FAQs, background materials and lists of current work in this field.
- The SIP Center - Portal with technical and market resources aimed at commercial developers. Also provides a testbed area for software and proxy development.
- pulver.com - A collection of information on the protocol. Contains news, reports and an IP telephony job noticeboard.
- Sipcall - A UK based service provider. Also contains hardware related links and protocol white-papers.
- Soft Front - Provides a development environment for software centered around SIP/VoIP technology.
- SIP Forum - A membership based forum. Also contains a news board.
- PROTOS Test Suite - A test-suite to find vulnerabilities in protocol software.
- SIPquest Inc. - Software component developer for service providers and telecom equipment vendors.
- Brekeke Software - Products for small to medium sized offices and a server database.
- Parrish Systems - Sells off the shelf code and provides a software consultancy service.
- Interactive Intelligence, Inc. - Developers of a proxy server. Site contains downloads, documentation and a forum.
- Ninetel USA - A USA based proxy service provider and supplier of hardware phones and routers. Site contains call rates and service details.
- Free IP Call - A proxy service provider with information in English and French.
- SIP411 Directory Services - A Yellow Pages style directory of SIP addresses.
- VoIP News - Information on available technologies and software/hardware product reviews.
- PC Phone Review - News and reviews of hardware, software and service providers in the United States.
- BaseVoice - Commercial software development company that produces PBX, router, proxy and application server software.
- VoIP User - Consumer guide and forum. Also has software phone downloads and links to service providers.
- SIP Wiki - Wiki based resource containing information and links.
- SIP Compose Group - A working group experimenting and documenting the protocol. Contains various internet technical resources.
- Voice System - Design, consultancy and development for SIP Express Router (SER) servers.
- LignUp Corp - Applications developer. Products include software PBX's for enterprise and service providers.
- Tech Invite - Portal containing links to technical information and RFC documentation.
- SIPfoundry - An international open source community providing VoIP solutions and technology based on the SIP standard.
- OpenSER - A branch of the SIP Express Router project, offering an open-source SIP server.
- eSMS.com - Provides UK phone numbers which forward calls to SIP.
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