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Session Initiation Protocol (SIP) - FAQs, background materials and lists of current work in this field. |
| FirstHand Technologies - Client and server software developer for service providers and telecom equipment vendors, to address enterprise mobility markets. |
| IETF SIP Charter - Working group for protocol development. Links to RFC's and internet drafts. |
| 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. |
| SIP411 Directory Services - A Yellow Pages style directory of SIP addresses. |
| SIP Forum - A membership based forum. Also contains a news board. |
| SIP Made Easy - An introductory tutorial talks about protocol functions, components, message types, how it works and where it is applied. |
| SIP Wiki - Wiki based resource containing information and links. |
| SIPfoundry - An international open source community providing VoIP solutions and technology based on the SIP standard. |
| Soft Front - Provides a software development environment. |
| Tech Invite - Portal containing links to technical information and RFC documentation. |
| Vidosystem - Produces softphones. Site has downloads section and information on protocols supported. |
| Voice System - Design, consultancy and development for SIP Express Router (SER) servers. |
| VoIP User - Consumer guide and forum. Also has software phone downloads and links to service providers. |
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