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Web Sites in Category SIP
Session Initiation Protocol (SIP)  - FAQs, background materials and lists of current work in this field.
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.
Curibo - German vendor offering hardware and software products.
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.
SIP Forum - A membership based forum. Also contains a news board.
SIP411 Directory Services - A Yellow Pages style directory of SIP addresses.
Sipcall - A UK based service provider. Also contains hardware related links and protocol white-papers.
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.
The SIP Center - Portal with technical and market resources aimed at commercial developers. Also provides a testbed area for software and proxy development.
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.
Editors:
mzero
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