- Session Initiation Protocol
- Definition of the IETF protocol for initiating interactive user sessions involving video, chat, gaming, voice, and virtual reality. - SIP Center
- Promoting commercial development. - SIP Forum
- News, information, products, working groups, and more. - SIP: Session Initiation Protocol
- A signaling protocol for Internet conferencing, telephony, presence, events notification and instant messaging. - SIPfoundry
- All about improving and adopting open source projects related to SIP - the Session Initiation Protocol.
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