SIPfoundry
An international open source community providing VoIP solutions and technology based on the SIP standard.
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.
The SIP Center
Portal with technical and market resources aimed at commercial developers. Also provides a testbed area for software and proxy development.
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.
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