SIPquest Inc.
Software component developer for service providers and telecom equipment vendors.
Soft Front
Provides a development environment for software centered around SIP/VoIP technology.
Tech Invite
Portal containing links to technical information and RFC documentation.
Voice System
Design, consultancy and development for SIP Express Router (SER) servers.
VoIP News
Information on available technologies and software/hardware product reviews.
VoIP User
Consumer guide and forum. Also has software phone downloads and links to service providers.
Session Initiation Protocol (SIP)
FAQs, background materials and lists of current work in this field.
BaseVoice
Commercial software development company that produces PBX, router, proxy and application server software.
Brekeke Software
Products for small to medium sized offices and a server database.
eSMS.com
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.
LignUp Corp
Applications developer. Products include software PBX's for enterprise and service providers.
Ninetel USA
A USA based proxy service provider and supplier of hardware phones and routers. Site contains call rates and service details.
OpenSER
A branch of the SIP Express Router project, offering an open-source SIP server.
Parrish Systems
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.
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.
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