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Products for small to medium sized offices and a server database.
http://www.brekeke.com/
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Client and server software developer for service providers and telecom equipment vendors, to address enterprise mobility markets.
http://www.firsthandtech.com/
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Sells off the shelf code and provides a software consultancy service.
http://www.parrishsys.com
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A collection of information on the protocol. Contains news, reports and an IP telephony job noticeboard.
http://www.pulver.com/
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Portal with technical and market resources aimed at commercial developers. Also provides a testbed area for software and proxy development.
http://www.sipcenter.com/
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A Yellow Pages style directory of SIP addresses.
http://www.sip411.com
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A membership based forum. Also contains a news board.
http://www.sipforum.org/
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An international open source community providing VoIP solutions and technology based on the SIP standard.
http://www.sipfoundry.org/
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Portal containing links to technical information and RFC documentation.
http://www.tech-invite.com
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Produces softphones. Site has downloads section and information on protocols supported.
http://www.vidosystem.com
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Design, consultancy and development for SIP Express Router (SER) servers.
http://www.voice-sistem.ro
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Consumer guide and forum. Also has software phone downloads and links to service providers.
http://www.voipuser.org
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