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`Document Details
`
`Source : Network World
`
`Volume :
`
`Issue :
`
`Date : 2002 Aug. 12
`
`Pages :
`
`Author : Grobel, Ian
`
`Title : SIP is a key part in multimedia sessions
`
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`CSCO-1009
`Cisco v. Uniloc
`Page 1 of 5
`
`

`

`t&B
`
`Ai:sa
`ii
`
`
`
`DG)
`com
`
`| Dubious record Venture capital investment in network nen mM... Mai aana Licht
`
` start-ups declines for a record eighth straight quarter this spring. PAGE 10.
`
`The leaderin network knowledge # www.nwfusion.com
`
`August 12, 2002 m Volume 19, Number 32
`
`
`
`New applications based on
`SessionInitiation Protocol
`could spur voice-over-IP
`
`
`migration. PagQ At.
`
`
`
`
`
`
`
`
`Page 45,
`
`
`a ese
`
`SECTOR SPOTLIGHT,
`Schools across the
`country are learning
`the ABCs of VoIP.
`
`
`
`Page 46.
`
`RANDY LYHUS
`
`The Sept. 11 attacks
`forced a Manhattan
`college to speed upits
`VoIP implementation.
`
`@ BY PHIL HOCHMUTH AND
`DENI CONNOR
`
`
`
`SAN FRANCISCO — While a
`slew of vendors will make prod-
`uct splashes this week at Linux-
`World Expo, 5un’s jump into
`the enterprise Linux server mar-
`ket
`is expected to make the
`biggest waves.
`two general-
`Sun will unveil
`purpose,Intel-based servers run-
`ning its own version of Linux,
`setting the companyapart from
`rivals such as Hewlett-Packard
`and IBMthatrely more heavily on
`technology from Linux partners.
`Sun will differentiate the servers,
`officially called the Cobalt LX50s
`(but previously known as Big
`Bear), by bundling in a bevy of
`software, including an applica-
`tion server, clustering technology,
`
`
`Deadline-tiears-for execs to sign oath
`
`CFOs of 947 publicly
`M@ BY JENNIFER MEARS AND AJ (EAs
`U.S. companies —- many
`TIM GREENE
`traded
`ENERALOLIGFareech giants — that
`Call
`it D-day for GENER have revenues ofat least $1.2 bil-
`America.
`lion to sign a Securities and Ex-
`Aug.14 is the deadline for most
`change Commission (SEC) docu-
`
`
`
`
`NEWSPAPERwm$5.00
`
`PEP Pyros ppg
`eyise
`xi Ni ieny
`Gere Wd
`WELSHE SYRS) Jo ALlSe#aaiia
`G27 458 SO-HeTTUINS A] Fader
`SPrdgis
`#d8n
`gy
`it pao Zezn
`aQedov 8,01 Sae
`G Ott
`ZELGd RAVAN MM ANNAN MEM XXAMME MRC USN
`
`ment personally attesting that
`their companies’ most recent fi-
`nancialfilings are accurate and
`complete.
`Depending on how the compa-
`nies align their fiscal years, some
`executives have until Dec. 27 to
`file the forms, but failure to sign
`the documents canresult in fines
`orjail terms for the executives .As
`of Friday, 114 CEOshadfiled.
`The list of those who must
`sign these documentsreadslike
`a who's who of computing and
`communications: Microsoft's
`Steve Ballmer, Intel’s Craig Barrett,
`See D-day, page 12
`
`
`
`a directory managementtools
`“Sun has donea better jobat scal-
`and Java 2 Standard Edition.
`ing Unix than anyone. Id be sur-
`“Sun can potentially do Linux
`prised if they didn’t do that with
`better than any other [server]
`Linux. Combinedwith Solaris,Sun
`vendor’says Bill Claybrook, an
`could have a good story here”
`analyst with Aberdeen Group.
`See Linux, page 14
`
`
`WEBLOGS IN THE WORKPLACE
`
`Blogs finding fans
`In business world
`
`mw BY JOHN COX
`
`Are Weblogs a legitimate
`business tool, or merely the
`Internet’s latest vehicle for
`personal indulgence?
`Phillip Windley, CIO for the
`state of Utah, is among those
`trying to find out.In June he
`
`
`
`b&l'd been looking fora
`Vellicle to communicate my
`counges2,00Tsienand
`ideas about enterprise Ito
`about 18,000 otherstate em-
`votrare‘orwhat‘mightbe my staffand to others.49
`called strategic noodling.
`Phillip Windley,
`For the first 100 state em-
`ClO, state of Utah
`ployees whotake him up on
`his offer,the state IT group will
`pay $40 for a Weblogging product from UserLand called Radio User-
`Land.So far, the only rule governing what participants write aboutis a
`general guideline from Windley that Weblog contributors think care-
`fully about what they want to post on their URLs, which are accessible
`to anyonefor the.time being.
`“I have hopes[for this project], but I wouldn't say I have greatex-
`pectations,’ Windley says.“If everybody just wrote every day [about
`things suchas] ‘Here's an interesting problem I had today and then
`we hook up a Google [Web search] appliance, we can create a
`See Blogs, page 16
`
`CSCO-1009
`Cisco v. Uniloc
`Page 2 of 5
`
`CSCO-1009
`Cisco v. Uniloc
`Page 2 of 5
`
`

`

`he deadline for most have revenues of at least
`
`U.S. companies
`traded
`GENERALSBFEschgiant
`day for corporate
`
`lion to sign a Securities
`change Commission (SE
`
`
`
`(cid:3)
`
`CSCO-1009
`Cisco v. Uniloc
`Page 3 of 5
`
`

`

`key to range of multimedia sessions. i
`
`|
`#1 35 Steve Blass: Ask Dr
`Internet.
`Net.Worker
`5
`—-»«==«B 36 Mark Gibbs:Describing
`as
`B21 Seats dental insurance
`
`«software.
`| Iiarac
`ie
`orovider turns to rural community
`1. ee~
`Oe
`for inexpensive space and qualified
`i
`_ Compendium
`vores,
`Ewe Keita3 ms
`| Audio Q&A
`|
`Ifyou enjoy our interview with 3Com CEO Bruce Claflin on page 17,
`|
`Microsoft's newest threat: Google
`.
`: 0 ss
`head online to hear more.
`|
`Fusion Executive Editar Adam Gaffin alertsyou to a speech
`
`Entersrise
`pinions
`DocFinder: 1745
`*
`by Microsoft Vice President Yusuf Mehdi, who thinks the
`Applications
`| 838 Editorials MPLS is the
`;
`|
`search engine could pose a problem to MSN.
`B23 Wireless
`hapes
`future, but ATM hangs on.
`VoIP: Getting ready
`|
`DooFinder: 1746
`technal
`|
`In this online-exclusive story to our Technology Insider on convergence,
`po
`WIPERS tecrinology reshapes
`| 39 Joel Snyder: Securin
`
`+
`learn how to start figuring out what your network needs to be able to Help Desk
`retalers.
`i
`the wireless LAN yder:
`»
`Hai 23 Ecora putting foot in patch
`an
`support IP telephony.
`Token ring and Ethernet
`-
`management.
`i 39 James Kobielus:
`|
`DocFinder: 1750
`—
`Golumnist Ron Nutter helps a user who's trying to connect
`8124 Scott Bradner: Can the
`| Miorosoft sunnorts SAML, sort gk
`|
`;
`|
`five people with Ethemet cards to a token-ring network.
`DMGAhide SSNs?
`l62Backspin: The cons of
`|-—-«=-Galll for entries: User Excellence Award
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`DooFinder: 1747
`|
`4i::
`the pros,
`_
`Take a shot at winning our 18th annual User Excellence Award compe-
`Telework Beat
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`s
`i
`’
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`lition for your latest and greatest network prgject.Fill out our online
`
`Service Providers 52 'Net Buzz: More on spam
`nomination form.
`Bridging the IT-telework gan
`:
`i
`i
`@ 27 FCCChairman Powell's com-
`i
`and spam fiers.
`DocFinder: 1234
`Neto Manag Editor Toni Kistner voloth often
`,
`ments highlight ambiguity in rules
`.
`|
`i
`dysfunctional relationship between teleworkers an
`IT.
`|
`governing any shutdown ofWord- Management
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`DocFinder: 1748
`Com's Internet backbone.
`© E48 Taking stock of skills:
`ponera :
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`_ Wa¥lers and IBM launched skits
`= NOP training comes to you! a | Viewfrom The Edge
`Coopers and Nasdaq launch Net
`;
`assessment programs to guide their
`Lookingfora cost-effective way to train yourteam? Tryingto widenyour
`Unbridled optimism
`Web service pilot project
`'
`IT staffs’ career development.
`|
`department's skil set on ashrinkingbudget?With equipmentprovidedby The Edge Managing Editor Jim Duffy looks at beleaguered
`.
`:
`|
`Avaya, NetSmart's on-site VolP training is the perfect way to educate
`|
`Lucent, whose officials are upbeat —— almost ebullient —
`28 Johna Till Johnson:
`|
`your staff without leaving the office,
`|
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`Here's a back-up strategy for a
`|
`DocFinder: 9945
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`world without WorldCom,
`30 Special Focus: ASPs
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`are learning to adapt.
`eineninantntinernnreeinnineanananettannins
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`| What is DocFinder?
`@ CONTACT US NetworkWorld, 118Turnpike Road, Southborough,
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`MA 01772; Phone: (508) 460-3333; Fax: (508) 490-6438;
`We’ve madeit easy to accessarticles and
`resources online. Simply enter the four-digit
`E-mail: nwnews@nww.com; STAFF: See the masthead on page.16
`DocFinder numberin the search box on the
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`ti
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`8
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`Marc Berube,IS training
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`
`
`#218 Sprinttouts nationwide 36 wireless service.
`8 Micromuseto keep eye on application service levels.
`@ 10 Survey: Network start-up investments side for record
`eighth consecutive quarter
`G2 10 Customers wait and see on Windows API openness.
`Ei 12 Tech firms quibble about stock option accounting.
`Ba 12 EMGadds advanced features to midrange array.
`#3 14 Positive Networks debuts enhanced VPN service.
`i 14 Linux news from Hewlett-Packard, IBM.
`
`| The Edge
`Infrastructure
`W817 3Com chief: Network marker M54 Giena exploits SONET.
`looking up.
`_
`1131 Bucking the downward trend.
`8 17 EDial brings aucio to
`Webconferencing,
`@ 18 Dave Kearns:
`:
`ares
`Microsoft: Muddying tne waters.
`
`|
`
`: Technology Update
`ane |
`#2 35 Session initiation Protocol is
`.
`
`CSCO-1009
`Cisco v. Uniloc
`Page 4 of 5
`
`

`

`| www.nwfusion.com
`
`
` ‘FECHNOLOGIES AND STANDARDS
`
` 8/12/02
`
`SHAPING YOUR NETWORK
`
`is a key part in multimedia sessions
`ol
`
`
`session communication parameters.
`
`SIP proxy server
`searchesfor correct
`Invitee’s SIP proxy server
`determines current location
`location of invitee, then
`Initiating SIP client
`connects to invitee’s
`and IP addressofinvitee, then
`sends query to SIP
`proxy server.
`SIP proxy server.
`passesinvitationto client.
`
`SIP client establishes session
`with invitee based on those
`session parameters.
`
`
`
`Client sends message backtoinitiating
`SIP client with information on possible
`
`M@ BY IAN GROBEL
`
`SessionInitiation Protocolis an applica-
`tion-level control protocol for setting up,
`changing and terminating multimedia
`sessions between participants on IP data
`networks.
`SIP can enable a range of services, such
`as Internet telephony, multimedia confer-
`encing, registration and redirection ser
`vices, and simplify connecting to VPNs.
`As its name implies, SIP is responsible for
`session signaling, a necessary exchange of
`messages to establish a communication
`session, be it voice, video or multimedia.
`SIP traces its roots to several Internet En-
`gineering Task Force (IETF) initiatives, and ©
`is tightly linked to Web and email tech-
`nologies and standards.
`SIP requires the use of user datagram pro-
`tocol (UDP) for performance. reasons, and
`TCPis optional. Given the unreliable nature
`of UDP SIP containsits own retransmission
`mechanisms, including a three-way ex-
`change between nodes for the purpose of
`establishing sessions.
`SIP is used to invite participants to a ses-
`sion, while the Session Description Pro-
`tocol (SDP)-encoded body of the SIP mes-
`sage contains information about what
`media types the parties can and will use.
`Once this information is exchanged and
`
`ments. The user agent resides on a partici-
`‘pant's chosen device (software on a PC,
`embeddedin a mobile telephone operat-
`ing system, PDA/palmtop device operating
`system, or the firmware element of an IP
`phone).The user agent contains server and
`client elements. The redirect server and
`proxy server perform routing and search
`tree functions. Both elements are typically
`network servers. A third network-based
`resourceserveris the registrar, which stores
`and receives participant locations.
`SIP can enable a range of rich communi-
`cation forms, including find me/follow me
`services, instant messaging, teleconferenc-
`ing and videoconferencing, centrex-type
`services (caller ID, call waiting and call
`hold), multiplayer gaming,realtime group
`authoring and remote whiteboarding.
`Using SIP also can make connecting to
`VPNseasier.
`With SIP it also is easy to combine con-
`versational multimedia services with other
`categories of services, such as directory
`information, Web browsing, positioning
`and presence.
`BecauseSIP is an application-layer proto-
`col, it
`is access-independent. Participants
`can be reached on any form ofIP network.
`As an example, SIP can offer seamless ser-
`vice capabilities between fixed and mobile
`networks, a key element in making the
`promise of fixed-to-mobile convergence a
`reality This capability will gain importance
`as 2.5G and 3G mobile networks are rolled
`out across the globe.
`
`Grobelis product manager with XACCT
`Technologies. He is based in Berlin,
`Germany and can be reached at ian.gro-
`bel@xacct.com.
`
`
`gration of SIP with Web- and mail-enabled
`technologies, which are tightly coupled
`with the URIs and their mappings.
`The close connection between SIP and
`DNS facilitates interoperability with tele
`phone systems and addressing mecha-
`nisms, as DNS Electronic Numbering
`System supports International Telecom-
`munications Union standard E.164 num-
`bering through the efforts of the JETF
`ENUM Working Group.Thislets SIP servers
`and clients send, receive and route tele-
`phone numbers.
`SIP components are broadly divided into
`two groups:user elements and network ele-
`Support for DNS is a key aspect ofthe inte-
`
`
`acknowledged, all participants are aware
`of the participants’ IP addresses, available
`bandwidth and media type. Then, data
`transmission begins using an appropriate
`transport protocol.Throughoutthe session,
`participants can make updates (indicating
`a new set of media types, addition of new
`parties to the session or other changes), by
`sending additional SIP messages.
`Destinations in SIP are represented with
`uniform resource indicators (URD, which
`have the same format as email addresses.
`This implies the use of DNS to map host
`and domain names to IP addresses.
`
`
`
`678. Whenweuse ws.ftp’proandtrytoconnec ‘
`ittimesout. We wantto forwardallincoming
`
`drinternet@changeatwork.com.
`
`CSCO-1009
`Cisco v. Uniloc
`Page 5 of 5
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