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SIP
Session Initiation Protocol is a telephony signaling protocol used in VoIP communications for initiating an interactive user session that involves multimedia elements such as video, voice, chat, gaming, virtual reality, mostly used for free.
| First released | 1996 |
| Developed by | Mark Handley, Henning Schulzrinne, Eve Schooler, Jonathan Rosenberg |
| Open-source | Not defined |
| Used by | Vodafone, Utel, AT&T |