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.
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.
SIP Forum
A membership based forum. Also contains a news board.
SIP Wiki
Wiki based resource containing information and links.
Sipcall
A UK based service provider. Also contains hardware related links and protocol white-papers.
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.
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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