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project    

PJSIP - Open Source SIP Stack
The PJSIP.ORG website provides the Open Source, comprehensive, high performance, small footprint multimedia communication libraries written in C language for building embedded/non-embedded VoIP applications. PJSIP - Open Source SIP Stack PJSIP is a SIP stack supporting many SIP extensions/features, with the following key benefits: Extremely portable Write the application once, and it would run on many many platforms (all...
preview: http://www.pjsip.org  

project    

SIPFoundry
International 'open source' project dedicated to accelerating the growth of SIP-based designs.
preview: http://www.sipfoundry.org  

organization    

Session Initiation Protocol (sip)
The Session Initiation Protocol (SIP) working group is chartered to continue the development of SIP, currently specified as proposed standard RFC 2543. SIP is a text-based protocol, similar to HTTP and SMTP, for initiating interactive communication sessions between users. Such sessions include voice, video, chat, interactive games, and virtual reality.
preview: http://www.ietf.org  

organization    

SIP Forum
The SIP Forum's mission is to advance the adoption of products and services based on the Session Initiation Protocol and to be the meeting place for developers of commercial SIP based services and Internet technology, such as Hosted IP-based Services, IP-PBXs, IP phones, PC clients and applications, SIP servers and IP telephony gateways. SIP (Session Initiation Protocol) has emerged as the protocol of choice for setting up conferencing,...
preview: https://www.sipit.net  

resource    

Session Initiation Tutorial (SIP) Knowledge Base
This is the SIP tutorial webpage. You may download our 150+ slides SIP tutorial in PDF from here. If you are looking for other SIP related technical information, you may also want to try the SIP website. If you still feel that you did not find what you were looking for you might try posting to the SIP Implementors' Mailing List (mailto:sip-implementors@cs.columbia.edu).
preview: http://www.iptel.org  

misc.    

Session Initiation Protocol Interoperability Tests
SIPITs, or Session Initiation Protocol Interoperability Tests, are weeklong events where people bring their SIP implementations to ensure they work together. The SIPITs are open to anyone with a working SIP implementation. The goal of the events is to refine both the protocol and its implementations. The SIPITs are a driving force shaping SIP into a globally interoperable protocol for real time Internet communication services.
preview: http://www.sipit.net  

personal page    

Henning Schulzrinne's SIP Page
SIP, the Session Initiation Protocol, is a signaling protocol for Internet conferencing, telephony, presence, events notification and instant messaging. SIP was developed within the IETF MMUSIC (Multiparty Multimedia Session Control) working group, with work proceeding since September 1999 in the IETF SIP working group.
preview: http://www.cs.columbia.edu