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SIP

(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...

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Definition: SIP

(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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    At the Interop conference in Las Vegas, Kevin Kennedy, CEO of Avaya, outlines the characteristics of Session Initiation Protocol. He sees SIP as a consolidating technology that will follow a...

    Videos | April 28, 2010 1:34pm PDT

  • Interop: Avaya chief pushes SIP

    At the Interop conference in Las Vegas, Kevin Kennedy, CEO of Avaya, outlines the characteristics of Session Initiation Protocol. He sees SIP as a consolidating technology that will follow a...

    Blog posts | April 28, 2010 12:29pm PDT

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    Blog posts | September 9, 2009 8:02am PDT

  • Batman Meets VoIP

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    Blog posts | January 29, 2009 9:39am PST

  • Thoughts on Microsoft Response Point

    One of the products that stood out at last week's Internet Telephony EXPO was Microsoft Response Point. Built as an easy way to bring SIP-based digital telephony to small organizations, it's ease...

    Blog posts | September 24, 2008 12:17pm PDT

  • SIP is the future of telecommunications

    As was clear from last week's ITEXPO in Los Angeles, SIP is shaping up to be the standard replacement protocol for the traditional TDM / SS7 network. SIP trunking starts to make it possible to...

    Blog posts | September 22, 2008 8:40am PDT

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    Videos | July 7, 2008 4:35pm PDT

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    Blog posts | January 23, 2008 11:33pm PST

  • Here's how to do VoIP on your Nintendo DS

    On the GBAtemp Forum, user samuelv has figured out a way to turn his homebrew application into a SIP phone on the Nintendo DS platform. Here's how: First, you will need DLDI(Dynamically Linked...

    Blog posts | September 14, 2007 12:13pm PDT

  • Microsoft OCS SIP an advantage over Cisco?

    We start by noting Microsoft Business Division president Jeff Raikes' remarks last Thursday that Office Communications Server 2007 and the Office Communicator client are now code complete. The...

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  • Voice over IP is finally coming into its own

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    News items | June 4, 2003 12:00am PDT

  • VoIP--do it right

    Do your legwork up front--assess network capacity, evaluate systems, and set realistic ROI expectations--and you're halfway there toward a successful VoIP implementation.

    News items | August 12, 2002 12:00am PDT

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