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Avaya Custom EditionSIP is transforming instant messaging, voice, and video communications, by adding intelligence and reducing cost. The new world st

Part III: How SIP Transforms User Communicationsdescribes how SIP “addressing” works with the concept ofpresence to make reaching users easier, regard

Icons Used in This BookThroughout this book, I occasionally use icons to call atten-tion to material worth noting in a special way. Here is a list oft

Part 1The Case for SIPIn This Part䊳 Defining SIP䊳 Connecting people anywhere, anytime, on any device䊳 Facilitating interoperability䊳 Streamlining comm

With people more widely available and more connected thanever before, an unintended and unexpected communicationsparadox has emerged. Users need to ma

Presenting Presence ServicesSIP introduces a new model for communications through itssupport of presence. Presence enables you to locate a userand det

With SIP, communications become user-centric once again.A SIP address of record (AOR) provides one unifying identifierthat can be mapped across multip

Encouraging InteroperabilitySIP uses a text-based language. That doesn’t mean that SIP supports only text; it means that SIP’s messages are easy topro

transformation in communications between an enterpriseand its ecosystem of partners, suppliers, and customers.SIP may eventually become the unifying p

Building a Foundation forStandardized, IntelligentCommunicationsSIP, defined in IETF standards, is a structured, text-based pro-tocol that is modeled

We’re predicting that the multiple addresses associated withvarious modes of communication (IM, text messaging, e-mail,phone) will collapse into a sin

by Peter Gregorywith Tom Doria, Chris Stegh, and Jim SuForeword by Alan B. JohnstonSIPCommunicationsFORDUMmIES‰AVAYA CUSTOM EDITION01_041498 ffirs.qxp

Part 2SIP at a GlanceIn This Part䊳 Working with existing protocols䊳 Extending SIP to multimedia sessions䊳 Getting to know SIP presence䊳 Examining SIP

SIP Communications For Dummies, Avaya Custom Edition 14Based on Existing InternetStandardsAlthough SIP may seem new, it’s actually based on many proto

can reach Eileen’s multiple communication devices (known asuser agents or UAs to techno-types) without having to knoweach of Eileen’s unique device ad

Because a SIP URI supports both numeric (phone numbers)and alphanumeric (Internet-style addresses) formatted con-tact addressing, the public switched

A SIMPLE Presence SolutionOne of the key SIP extensions defined by the IETF is SIP forInstant Messaging and Presence Leveraging Extensions (oreven mor

Agents and Servers. These components can take the form ofan additional software program (on a laptop computer, forexample), or as an inherent part of

SIP devices can communicate directly if they know eachother’s URI or IP address, but in practice SIP servers areoften used in the network to provide a

⻬ Redirect Server. If users are not in their home domains,sessions bound for them needs to be redirected to them.The redirect server maps a SIP reques

Basic SIP OperationsThis section walks you through a basic communication session — how it works, and how SIP supports it. Figure 2-2illustrates the pa

An INVITE request is generated and sent to John.The INVITE message contains Session DescriptionProtocol (SDP) parameters that define the types ofmedia

SIP Communications For Dummies®, Avaya Custom EditionPublished byWiley Publishing, Inc.111 River StreetHoboken, NJ 07030-5774www.wiley.comCopyright ©

Part 3How SIP Transforms UserCommunicationsIn This Part䊳 Getting familiar with presence-enabled communications䊳 Routing communications with presence䊳

SIP Communications For Dummies, Avaya Custom Edition 24Probably the earliest manifestation of presence is the tele-phone network’s “busy signal”, sign

Using Presence to RouteCommunicationsSIP is unique in its ability to make call routing decisions basedupon presence. As Part 2 explains in detail, pre

Presence can span a number of different communicationchannels. The aggregated view of a user’s presence (that is,the availability across all of an ind

The Internet Engineering Task Force (IETF) has a work groupthat is working to standardize the SIMPLE protocol. SIMPLE isbased on RFC 3428, 3265, and 3

Because SIP can determine through the Session DescriptionProtocol (SDP) what type of media stream the answering UAcan support, SIP can make intelligen

• Virtual Business Card with every voice call so thatthe user can have the caller’s contact informationavailable.• Playback, skip, rewind, pause, slow

By linking multiple modes of communication with user prefer-ence, SIP provides a unifying solution that helps to reduceuser and operating costs by mak

a company can certainly gain cost savings and other effi-ciencies, the real benefit is that these efforts also serve as asteppingstone towards next-ge

What about the user’s highly personalized services such asaddress lists, buddy lists, and speed dials? SIP preference toolsfeatures can make these per

Publisher’s AcknowledgmentsWe’re proud of this book; please send us your comments through our online registra-tion form located at www.dummies.com/reg

Part 4How SIP TransformsEnterprise CommunicationsIn This Part䊳 Understanding how SIP and the PSTN work together䊳 Getting familiar with SIP trunks䊳 Fed

SIP Communications For Dummies, Avaya Custom Edition 34Working Together: SIP and the PSTNClearly the telco world with its country codes, area codes,ci

Traditional network modelBefore SIP and VoIP, enterprises connected their internal PBX-based telephone systems to carriers via dedicated TDM(Time Divi

appropriate federations and security protections establishedbetween them. The IP circuit continues to carry e-mail,Internet, and other corporate traff

automatically rerouted over the service provider SIP network to another enterprise location. For enterprises,this system offers great flexibility in p

In a converged network, voice becomes an IP application,sharing the common network infrastructure and services.Connecting SIP EnterprisesA common conc

⻬ Enabling SIP islands to discover the existence of oneanother⻬ Ensuring that the two islands interoperate⻬ Managing and controlling this interconnect

Federation allows these islands of SIP communications togrow and expand and interconnect. Businesses can maximizethe services and features from their

ENUM alternativesUntil ENUM (or a similar standard) is widely adopted by serv-ice providers, enterprises using SIP can leverage existing solu-tions su

SIP Communications For Dummies, Avaya Custom Edition 4208_041498 ch04.qxp 3/16/06 5:52 PM Page 42SIP guide

Contents at a GlanceForeword...vIntroduction...

Part 5SIP InteroperabilityIn This Part䊳 Getting greater interoperability within a company䊳 Examining interoperability between companies䊳 Looking at in

SIP Communications For Dummies, Avaya Custom Edition 44Generally, SIP-adopting companies can expect a greater likeli-hood of interoperability among pr

communications. Like TCP/IP in the 1980s and the World WideWeb in the 1990s, communications hardware and softwareproduct vendors are adding SIP capabi

⻬ SIP Foundry promotes interoperability of SIP prod-ucts. More information can be found at http://sipfoundry.org.⻬ SIPit (SIP Interoperability Tests)

⻬ Interoperability among IVRs.⻬ Firewalls.⻬ Conferencing bridges.⻬ Instant messaging platforms.In essence, these systems must rely on much more than s

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Part 6SIP and Server-FreeCommunicationsIn This Part䊳 Implementing SIP communications for small offices䊳 Getting the big picture on peer-to-peer commun

SIP Communications For Dummies, Avaya Custom Edition 50⻬ Deployment and Administrative Costs: Communicationssolutions often require on-site technical

The peer-to-peer layer effectively replaces the registration,location, and lookup steps of SIP. It handles three things:⻬ Registering a phone or a use

Reaping the Benefits of Peer-to-Peer SIPCommunications With peer-to-peer SIP technology, you can dramatically simplify telephone system setup and inst

ForewordThese days, in communications circles, Session InitiationProtocol, or SIP for short, is seemingly everywhere.SIP is supported by practically e

Peer-to-peer technology also enables sophisticated backup ofphones and voice mail. Remarkably, you can achieve all thiswith no significant additional

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Part 7SIP and the Future ofIntelligent Communications In This Part䊳 Increasing business applications’ productivity with presence䊳 Improving the ease a

SIP Communications For Dummies, Avaya Custom Edition 56Applications will not need to be customized to account fornew SIP capabilities. Rather, common

Seamless Use of MultipleDevicesSIP presence will improve the productivity of businesspeopleby enabling them to seamlessly use multiple communicationde

Combining presence from multiple SIP devices will inform thecaller that the user is present or not, but the caller will notneed to know on which numbe

night) will improve accordingly. It is likely that tools thatmanage and aggregate presence will emerge in the comingyears to manage and aggregate pres

location, the device they’re currently using, and other factors.Such control will help to address big-brother type privacyconcerns.Personal profile ma

Part 8Top Ten Reasons for SIP-Enhanced CommunicationsIn This Part䊳 Simplifying communications䊳 Gaining more control䊳 Working with divergent systems䊳 M

SIP Communications For Dummies, Avaya Custom Edition 62the right medium (voice, video, IM), on the right device, andat the right time. Turn to Part 3

Not bad for a little protocol developed in academia back inthe mid-1990s by such thinkers as Henning Schulzrinne andJonathan Rosenberg.The authors hav

Unified AddressingA single SIP AOR (address of record) provides a unifying iden-tifier that can be used for routing all communication to auser. Simply

Creation of New ServicesSIP is a structured, text-based protocol that is modeled afterHTTP, or HyperText Transport Protocol, the language thatpowers t

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Avaya Custom EditionSIP is transforming instant messaging, voice, and video communications, by adding intelligence and reducing cost. The new world st

IntroductionImagine a communications environment where a centraldirectory server not only knows how to reach an individ-ual’s work phone, cell phone,

SIP Communications For Dummies, Avaya Custom Edition 2well as in other industry groups working to make sure thatSIP works across enterprises that have