Session Initiation Protocol (SIP)
- FAQs, background materials and lists of current work in this field.
- http://www.cs.columbia.edu/sip/
Vidosystem - Produces softphones. Site has downloads section and information on protocols supported. - http://www.vidosystem.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
FirstHand Technologies - Client and server software developer for service providers and telecom equipment vendors, to address enterprise mobility markets. - http://www.firsthandtech.com/
SIPfoundry - An international open source community providing VoIP solutions and technology based on the SIP standard. - http://www.sipfoundry.org/
Tech Invite - Portal containing links to technical information and RFC documentation. - http://www.tech-invite.com
Voice System - Design, consultancy and development for SIP Express Router (SER) servers. - http://www.voice-sistem.ro
SIP Wiki - Wiki based resource containing information and links. - http://www.toyz.org/cgi-bin/sipwiki.cgi
VoIP User - Consumer guide and forum. Also has software phone downloads and links to service providers. - http://www.voipuser.org
SIP411 Directory Services - A Yellow Pages style directory of SIP addresses. - http://www.sip411.com
Parrish Systems - Sells off the shelf code and provides a software consultancy service. - http://www.parrishsys.com
Brekeke Software - Products for small to medium sized offices and a server database. - http://www.brekeke.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 Forum - A membership based forum. Also contains a news board. - http://www.sipforum.org/
Soft Front - Provides a software development environment. - http://www.softfront.co.jp/en/
pulver.com - A collection of information on the protocol. Contains news, reports and an IP telephony job noticeboard. - http://www.pulver.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/