Top : Computers : Internet : Protocols :
SIP
Websites
FAQs, background materials and lists of current work in this field.
http://www.cs.columbia.edu/sip/
Portal with technical and market resources aimed at commercial developers. Also provides a testbed area for software and proxy development.
http://www.sipcenter.com/
A collection of information on the protocol. Contains news, reports and an IP telephony job noticeboard.
http://www.pulver.com/
A UK based service provider. Also contains hardware related links and protocol white-papers.
http://www.sipcall.co.uk/
Provides a development environment for software centered around SIP/VoIP technology.
http://www.softfront.co.jp/en/
A membership based forum. Also contains a news board.
http://www.sipforum.org/
A test-suite to find vulnerabilities in protocol software.
http://www.ee.oulu.fi/research/ouspg/protos/testing/c07/sip/
Software component developer for service providers and telecom equipment vendors.
http://www.sipquest.com/
Products for small to medium sized offices and a server database.
http://www.brekeke.com/
Sells off the shelf code and provides a software consultancy service.
http://www.parrishsys.com
Developers of a proxy server. Site contains downloads, documentation and a forum.
http://www.inin.com/sipproxy
A USA based proxy service provider and supplier of hardware phones and routers. Site contains call rates and service details.
http://www.ninetelusa.com
A proxy service provider with information in English and French.
http://www.freeipcall.com
A Yellow Pages style directory of SIP addresses.
http://www.sip411.com
Information on available technologies and software/hardware product reviews.
http://www.voip-news.com
News and reviews of hardware, software and service providers in the United States.
http://www.pcphonereview.com
Commercial software development company that produces PBX, router, proxy and application server software.
http://www.basevoice.com
Consumer guide and forum. Also has software phone downloads and links to service providers.
http://www.voipuser.org
Wiki based resource containing information and links.
http://www.toyz.org/cgi-bin/sipwiki.cgi
A working group experimenting and documenting the protocol. Contains various internet technical resources.
http://compose.labri.fr/documentation/sip/
Design, consultancy and development for SIP Express Router (SER) servers.
http://www.voice-sistem.ro
Applications developer. Products include software PBX's for enterprise and and service providers.
http://www.lignup.com
Portal containing links to technical information and RFC documentation.
http://www.tech-invite.com
An international open source community providing VoIP solutions and technology based on the SIP standard.
http://www.sipfoundry.org/
A branch of the SIP Express Router project, offering an open-source SIP server.
http://openser.org/
Applications developer. Products include software PBX's for enterprise and service providers.
http://www.lignup.com/
Provides UK phone numbers which forward calls to SIP.
http://www.esms.com