Session Initiation Protocol (SIP)
FAQs, background materials and lists of current work in this field.
Commercial software development company that produces PBX, router, proxy and application server software.
Products for small to medium sized offices and a server database.
Provides UK phone numbers which forward calls to SIP.
Free IP Call
A proxy service provider with information in English and French.
Interactive Intelligence, Inc.
Developers of a proxy server. Site contains downloads, documentation and a forum.
Applications developer. Products include software PBX's for enterprise and service providers.
A USA based proxy service provider and supplier of hardware phones and routers. Site contains call rates and service details.
A branch of the SIP Express Router project, offering an open-source SIP server.
Sells off the shelf code and provides a software consultancy service.
PC Phone Review
News and reviews of hardware, software and service providers in the United States.
PROTOS Test Suite
A test-suite to find vulnerabilities in protocol software.
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.
SIP Compose Group
A working group experimenting and documenting the protocol. Contains various internet technical resources.
SIP411 Directory Services
A Yellow Pages style directory of SIP addresses.
A membership based forum. Also contains a news board.
Wiki based resource containing information and links.
A UK based service provider. Also contains hardware related links and protocol white-papers.
An international open source community providing VoIP solutions and technology based on the SIP standard.
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