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.
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