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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.

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First released 1996
Developed by Mark Handley, Henning Schulzrinne, Eve Schooler, Jonathan Rosenberg
Open-source Not defined
Used by Vodafone, Utel, AT&T

Development by Synergize.digital

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