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.
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.
eSMS.com
Provides UK phone numbers which forward calls to SIP.
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.
LignUp Corp
Applications developer. Products include software PBX's for enterprise and service providers.
Ninetel USA
A USA based proxy service provider and supplier of hardware phones and routers. Site contains call rates and service details.
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