Session Initiated Protocol or SIP. A standard communications protocol that establishes, modifies, and terminates real-time multimedia communications sessions transmitted over the internet. These communications generally include Voice over Internet Protocol (VoIP) calls, video conferencing, and online gaming. For VoIP calls, SIP uses other protocols, including Real-time Transport Protocol (RTP) and Secure Real-time Transport Protocol (SRTP).
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Merriam-Webster Online Dictionarysip (verb)
to take a sip of something especially repeatedly
to drink in small quantities
to take sips from
a small draft taken with the lips
the act of sipping