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.
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.
JustIT PBX
A solid state hybrid PBX product combining PSTN telephony with Voice over IP.
Ninetel USA
A USA based proxy service provider and supplier of hardware phones and routers. Site contains call rates and service details.
Parrish Systems
Sells off the shelf code for SIP, SDP and RTP protocols 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.
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