(1) A type of chip package. See system in package.
(2) A type of memory chip module. See single in-line package.
(3) (Software Isolated Process) See singularity.
(4) (SMDS Interface Protocol) See SMDS.
(5) (Software Integration Platform) A common format and interface for geographic data in the petroleum industry.
(6) (Session Initiation Protocol) An IP telephony signaling protocol that is widely used to start and terminate voice calls over the Internet (see VoIP). Supporting two-way and multi-party calls, SIP can be used for any real-time media transmission over an IP network, including video calling and conferencing. It is also used for instant messaging (see SIMPLE) and multiplayer gaming.
Based on HTTP and MIME, SIP is a text-based application protocol that is very flexible for integrated voice-data applications such as click-to-dial on a Web site. It uses fewer resources and is less complex than H.323, the ITU's protocol suite for IP telephony (see H.323). SIP's human-readable addressing scheme uses URLs; for example: sip:john.doe@company.com.
SIP relies on the session description protocol (SDP) for session description and the Real Time Transport Protocol (RTP) for transport (see RTP and SDP). Windows XP was the first version of Windows to natively support SIP for PC-based phone applications, and numerous vendors make SIP desktop phones. See SIP provider and SIP proxy.
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