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Cisco SIP IP Phone 7960Administrator GuideVersion 2.0Corporate HeadquartersCisco Systems, Inc.170 West Tasman DriveSan Jose, CA 95134-1706USAhttp://www.cisco.comTel: 408 526-4000800 553-NETS (6387)Fax: 408 526-4100Customer Order Number: DOC-7810497 Text Part Number: 78-10497-02

THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUTNOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUTARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FORTHEIR APPLICATION OF ANY PRODUCTS.THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATIONPACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TOLOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY.The following information is for FCC compliance of Class A devices: This equipment has been tested and found to comply with the limits for a ClassA digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference whenthe equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio-frequency energy and, if not installedand used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in aresidential area is likely to cause harmful interference, in which case users will be required to correct the interference at their own expense.The following information is for FCC compliance of Class B devices: The equipment described in this manual generates and may radiateradio-frequency energy. If it is not installed in accordance with Cisco’s installation instructions, it may cause interference with radio and televisionreception. This equipment has been tested and found to comply with the limits for a Class B digital device in accordance with the specifications inpart 15 of the FCC rules. These specifications are designed to provide reasonable protection against such interference in a residential installation.However, there is no guarantee that interference will not occur in a particular installation.Modifying the equipment without Cisco’s written authorization may result in the equipment no longer complying with FCC requirements for ClassA or Class B digital devices. In that event, your right to use the equipment may be limited by FCC regulations, and you may be required to correctany interference to radio or television communications at your own expense.You can determine whether your equipment is causing interference by turning it off. If the interference stops, it was probably caused by the Ciscoequipment or one of its peripheral devices. If the equipment causes interference to radio or television reception, try to correct the interference byusing one or more of the following measures: Turn the television or radio antenna until the interference stops. Move the equipment to one side or the other of the television or radio. Move the equipment farther away from the television or radio. Plug the equipment into an outlet that is on a different circuit from the television or radio. (That is, make certain the equipment and the televisionor radio are on circuits controlled by different circuit breakers or fuses.)Modifications to this product not authorized by Cisco Systems, Inc. could void the FCC approval and negate your authority to operate the product.The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) aspart of UCB’s public domain version of the UNIX operating system. All rights reserved. Copyright 1981, Regents of the University of California.NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS AREPROVIDED “AS IS” WITH ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSEDOR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE ANDNONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE.IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTALDAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE ORINABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCHDAMAGES.Access Registrar, AccessPath, Are You Ready, ATM Director, Browse with Me, CCDA, CCDE, CCDP, CCIE, CCNA, CCNP, CCSI, CD-PAC,CiscoLink, the Cisco NetWorks logo, Cisco Powered Network logo, Cisco Systems Networking Academy, Fast Step, FireRunner, Follow MeBrowsing, FormShare, GigaStack, IGX, Intelligence in the Optical Core, Internet Quotient, IP/VC, iQ Breakthrough, iQ Expertise, iQ FastTrack, iQLogo, iQ Readiness Scorecard, Kernel Proxy, MGX, Natural Network Viewer, Network Registrar, the Networkers logo, Packet, PIX, Point and ClickInternetworking, Policy Builder, RateMUX, ReyMaster, ReyView, ScriptShare, Secure Script, Shop with Me, SlideCast, SMARTnet, SVX,TrafficDirector, TransPath, VlanDirector, Voice LAN, Wavelength Router, WebViewer, Workgroup Director, and Workgroup Stack are trademarksof Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn, Empowering the Internet Generation, are service marks of CiscoSystems, Inc.; and Aironet, ASIST, BPX, Catalyst, Cisco, the Cisco Certified Internetwork Expert Logo, Cisco IOS, the Cisco IOS logo, Cisco Press,Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Collision Free, Enterprise/Solver, EtherChannel, EtherSwitch, FastHub, FastLink,FastPAD, IOS, IP/TV, IPX, LightStream, LightSwitch, MICA, NetRanger, Post-Routing, Pre-Routing, Registrar, StrataView Plus, Stratm,SwitchProbe, TeleRouter, and VCO are registered trademarks of Cisco Systems, Inc. or its affiliates in the U.S. and certain other countries.All other brands, names, or trademarks mentioned in this document or Web site are the property of their respective owners. The use of the wordpartner does not imply a partnership relationship between Cisco and any other company. (0010R)Cisco SIP IP Phone 7960 Administrator GuideCopyright 2000, Cisco Systems, Inc.All rights reserved.

C O N T E N T SAbout This Guide ixOverview ixWho Should Use This Guide ixObjectives xOrganization xRelated Documentation xiDocument Conventions xiObtaining Documentation xvWorld Wide Web xvDocumentation CD-ROM xvOrdering Documentation xvObtaining Technical Assistance xvCisco Connection Online xviTechnical Assistance Center xviDocumentation Feedback xviiCHAPTER1Product Overview 1-1What is Session Initiation Protocol? 1-1Components of SIP 1-3SIP Clients 1-4SIP Servers 1-5Cisco SIP IP Phone 7960 Administrator Guide78-10497-02iii

ContentsWhat is the Cisco SIP IP Phone 7960? 1-5Supported Features 1-7Supported Protocols 1-10Prerequisites 1-12Cisco SIP IP Phone Connections 1-13Connecting to the Network 1-13Connecting to Power 1-14Using a Headset 1-15The Cisco SIP IP Phone with a Catalyst Switch 1-16CHAPTER2Getting Started with Your Cisco SIP IP Phone 2-1Initialization Process Overview 2-1Installing the Cisco SIP IP Phone 2-3Installation Task Summary 2-3Downloading Files to Your TFTP Server 2-4Configuring SIP Parameters 2-5Configuring SIP Parameters via a TFTP Server 2-6Manually Configuring the SIP Parameters 2-11Configuring Network Parameters 2-13Configuring Network Parameters via a DHCP Server 2-14Manually Configuring the Network Parameters 2-14Connecting the Phone 2-16Adjusting the Placement of the Cisco SIP Phone 2-18Verifying Startup 2-20Cisco SIP IP Phone 7960 Administrator Guideiv78-10497-02

ContentsUsing the Cisco SIP IP Phone Menu Interface 2-21Reading the Cisco SIP IP Phone Icons 2-22Customizing the Cisco SIP IP Phone Ring Types 2-24Creating Dial Plans 2-24CHAPTER3Managing Cisco SIP IP Phones 3-1Entering Configuration Mode 3-1Unlocking Configuration Mode 3-2Locking Configuration Mode 3-2Modifying the Phone’s Network Settings 3-2Modifying the Phone’s SIP Settings 3-5Modifying SIP Parameters via a TFTP Server 3-8Modifying the Default SIP Configuration File 3-8Modifying the Phone-Specific SIP Configuration File 3-15Modifying the SIP Parameters Manually 3-18Setting the Date, Time, and Daylight Savings Time 3-22Erasing the Locally-Defined Settings 3-28Erasing the Locally-Defined Network Settings 3-28Erasing the Locally-Defined SIP Settings 3-29Accessing Status Information 3-30Viewing Status Messages 3-31Viewing Network Statistics 3-31Viewing the Firmware Version 3-33Upgrading the Cisco SIP IP Phone Firmware 3-33Performing an Image Upgrade and Remote Reboot 3-35Cisco SIP IP Phone 7960 Administrator Guide78-10497-02v

ContentsAPPENDIXASIP Compliance with RFC-2543 Information A-1SIP Functions A-2SIP Methods A-2SIP Responses A-31xx Response—Information Responses A-42xx Response—Successful Responses A-43xx Response—Redirection Responses A-54xx Response—Request Failure Responses A-55xx Response—Server Failure Responses A-106xx Response—Global Responses A-10SIP Header Fields A-10SIP Session Description Protocol (SDP) Usage A-12APPENDIXBSIP Call Flows B-1Call Flow Scenarios for Successful Calls B-2Gateway-to Cisco SIP IP Phone—Successful Call Setup and Disconnect B-3Gateway-to-Cisco SIP IP Phone—Successful Call Setup and Call Hold B-7Gateway to-Cisco SIP IP Phone—Successful Call Setup and CallTransfer B-11Cisco SIP IP Phone-to-Cisco SIP IP Phone Simple Call Hold B-16Cisco SIP IP Phone-to-Cisco SIP IP Phone Call Hold with Consultation B-20Cisco SIP IP Phone-to-Cisco SIP IP Phone Call Waiting B-25Cisco SIP IP Phone-to-Cisco SIP IP Phone Call Transfer withoutConsultation B-31Cisco SIP IP Phone-to-Cisco SIP IP Phone Call Transfer withConsultation B-35Cisco SIP IP Phone-to-Cisco SIP IP Phone Network Call Forwarding(Unconditional) B-41Cisco SIP IP Phone 7960 Administrator Guidevi78-10497-02

ContentsCisco SIP IP Phone-to-Cisco SIP IP Phone Network Call Forwarding(Busy) B-44Cisco SIP IP Phone-to-Cisco SIP IP Phone Network Call Forwarding (NoAnswer) B-48Cisco SIP IP Phone-to Cisco SIP IP Phone 3-Way Calling B-52Call Flow Scenarios for Failed Calls B-58Gateway-to-Cisco SIP IP Phone—Called User is Busy B-58Gateway-to-Cisco SIP IP Phone—Called User Does Not Answer B-60Gateway-to-Cisco SIP IP Phone—Client, Server, or Global Error B-63Cisco SIP IP Phone-to-Cisco SIP IP Phone—Called User is Busy B-66Cisco SIP IP Phone-to-Cisco SIP IP Phone—Called User Does NotAnswer B-68Cisco SIP IP Phone-to-Cisco SIP IP Phone—Authentication Error B-70APPENDIXCTechnical Specifications C-1Physical and Operating Environment Specifications C-1Cable Specifications C-3Connections Specifications C-3APPENDIXDTranslated Safety Warnings D-1Installation Warning D-1Product Disposal Warning D-2Lightning Activity Warning D-3SELV Circuit Warning (other versions available) D-4Circuit Breaker (15A) Warning D-6Cisco SIP IP Phone 7960 Administrator Guide78-10497-02vii

ContentsGLOSSARYINDEXCisco SIP IP Phone 7960 Administrator Guideviii78-10497-02

About This GuideOverviewThe Cisco Session Initiation Protocol (SIP) IP Phone 7960 Administrator Guideprovides information about how to setup, connect cables to, and configure aCisco SIP IP phone 7960 (hereafter referred to as a Cisco SIP IP phone). Theadministrator guide also provides information on how to configure the networkand SIP settings and change the settings and options of the Cisco SIP IP phone.The administrator guide also includes reference information such as Cisco SIP IPphone call flows and compliance information.Who Should Use This GuideNetwork engineers, system administrators, or telecommunication engineersshould use this guide to learn the steps required to properly set up the Cisco SIPIP phone on the network.The tasks described are considered to be administration-level tasks and are notintended for end-users of the phones. Many of the tasks involve configuringnetwork settings which could affect the phone’s ability to function in the networkand require an understanding of IP networking and telephony concepts.Cisco SIP IP Phone 7960 Administrator Guide78-10497-02ix

About This GuideObjectivesObjectivesThe Cisco SIP IP Phone 7960 Administrator Guide provides necessaryinformation to get the Cisco SIP IP phone operational in a Voice-over-IP (VoIP)network.It is not the intent of this administrator guide to provide information on how toimplement a SIP VoIP network. For information on implementing a SIP VoIPnetwork, refer to the documents listed in the “Related Documentation” section onpage xi.OrganizationThis administrator guide is divided into the following chapters and appendixes: Chapter 1, “Product Overview” describes SIP and the Cisco SIP IP phone. Chapter 2, “Getting Started with Your Cisco SIP IP Phone” describes how toinstall, connect, and configure the Cisco SIP IP phone. Chapter 3, “Managing Cisco SIP IP Phones” describes how to modify theCisco SIP IP phone’s network and SIP settings, how to access network andcall status information, and how to upgrade the firmware. Appendix A, “SIP Compliance with RFC-2543 Information” providesreference information about the SIP IP phone compliance to RFC 2543. Appendix B, “SIP Call Flows” provides reference information about theSIP IP phone call flows. Appendix C, “Technical Specifications” lists the physical and operatingenvironment specifications, cable specifications, and connectionspecifications. Appendix D, “Translated Safety Warnings” lists translated safety warningsthat should be followed when installing an electrical device such as theSIP IP phone.Cisco SIP IP Phone 7960 Administrator Guidex78-10497-02

About This GuideRelated DocumentationRelated DocumentationThe following is a list of related Cisco SIP VoIP publications. For moreinformation about implementing a SIP VoIP network refer to the followingpublications: Session Initiation Protocol Gateway Call Flows Session Initiation for VoIP on Cisco Access Platforms Getting Started with the Cisco IP Phone 7960 Installing the Wall Mount Kit for the Cisco IP PhoneThe following is a list of Cisco VoIP publications that provide information aboutimplementing a VoIP network: Service Provider Features for Voice over IP (introduced in Cisco IOS Release12.0(3)T) Cisco IOS IP and IP Routing Configuration Guide Cisco IOS Release 12.1 Multiservice Applications Configuration Guide Voice over IP for the Cisco 2600 and Cisco 3600 Series Routers Voice over IP for the Cisco AS5300 DocumentsDocument ConventionsThis document uses the following conventions: Commands and keywords are in boldface font. Arguments for which you supply values are in italic font. Elements in square brackets ([ ]) are optional. Alternative keywords are grouped in braces and separated by verticalbars (for example, { x y z }). Optional alternative keywords are grouped in brackets and separated byvertical bars (for example, [ x y z ]). Terminal sessions and information the system displays are in Information you must enter is in boldfacescreenscreenfont.font.Cisco SIP IP Phone 7960 Administrator Guide78-10497-02xi

About This GuideDocument ConventionsNotes use the following conventions:NoteMeans reader take note. Notes contain helpful suggestions orreferences to material not covered in the publication.Cautions use the following conventions:CautionMeans reader be careful. In this situation, you might do somethingthat could result in equipment damage or loss of data.Warnings use the following conventions:WarningThis warning symbol means danger. You are in a situation thatcould cause bodily injury. Before you work on any equipment, beaware of the hazards involved with electrical circuitry and befamiliar with standard practices for preventing accidents. (Tosee translations of the warnings that appear in this publication,refer to the appendix, “Translated Safety Warnings.”)WaarschuwingDit waarschuwingssymbool betekent gevaar. U verkeert in eensituatie die lichamelijk letsel kan veroorzaken. Voordat u aanenige apparatuur gaat werken, dient u zich bewust te zijn van debij elektrische schakelingen betrokken risico’s en dient u op dehoogte te zijn van standaard maatregelen om ongelukken tevoorkomen. (Voor vertalingen van de waarschuwingen die indeze publicatie verschijnen, kunt u het aanhangsel “TranslatedSafety Warnings” (Vertalingen van veiligheidsvoorschriften)raadplegen.)Cisco SIP IP Phone 7960 Administrator Guidexii78-10497-02

About This GuideDocument ConventionsVaroitusTämä varoitusmerkki merkitsee vaaraa. Olet tilanteessa, joka voijohtaa ruumiinvammaan. Ennen kuin työskentelet minkäänlaitteiston parissa, ota selvää sähkökytkentöihin liittyvistävaaroista ja tavanomaisista onnettomuuksien ehkäisykeinoista.(Tässä julkaisussa esiintyvien varoitusten käännökset löydätliitteestä "Translated Safety Warnings" (käännetyt turvallisuuttakoskevat varoitukset).)AttentionCe symbole d’avertissement indique un danger. Vous vous trouvezdans une situation pouvant entraîner des blessures. Avantd’accéder à cet équipement, soyez conscient des dangers poséspar les circuits électriques et familiarisez-vous avec lesprocédures courantes de prévention des accidents. Pour obtenirles traductions des mises en garde figurant dans cettepublication, veuillez consulter l’annexe intitulée « TranslatedSafety Warnings » (Traduction des avis de sécurité).WarnungDieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einerSituation, die zu einer Körperverletzung führen könnte. Bevor Siemit der Arbeit an irgendeinem Gerät beginnen, seien Sie sich dermit elektrischen Stromkreisen verbundenen Gefahren und derStandardpraktiken zur Vermeidung von Unfällen bewußt.(Übersetzungen der in dieser Veröffentlichung enthaltenenWarnhinweise finden Sie im Anhang mit dem Titel “TranslatedSafety Warnings” (Übersetzung der Warnhinweise).)AvvertenzaQuesto simbolo di avvertenza indica un pericolo. Si è in unasituazione che può causare infortuni. Prima di lavorare suqualsiasi apparecchiatura, occorre conoscere i pericoli relativiai circuiti elettrici ed essere al corrente delle pratiche standardper la prevenzione di incidenti. La traduzione delle avvertenzeriportate in questa pubblicazione si trova nell’appendice,“Translated Safety Warnings” (Traduzione delle avvertenze disicurezza).Cisco SIP IP Phone 7960 Administrator Guide78-10497-02xiii

About This GuideDocument ConventionsAdvarselDette varselsymbolet betyr fare. Du befinner deg i en situasjonsom kan føre til personskade. Før du utfører arbeid på utstyr, mådu være oppmerksom på de faremomentene som elektriskekretser innebærer, samt gjøre deg kjent med vanlig praksis nårdet gjelder å unngå ulykker. (Hvis du vil se oversettelser av deadvarslene som finnes i denne publikasjonen, kan du se ivedlegget "Translated Safety Warnings" [Oversattesikkerhetsadvarsler].)AvisoEste símbolo de aviso indica perigo. Encontra-se numa situaçãoque lhe poderá causar danos fisicos. Antes de começar atrabalhar com qualquer equipamento, familiarize-se com osperigos relacionados com circuitos eléctricos, e com quaisquerpráticas comuns que possam prevenir possíveis acidentes. (Paraver as traduções dos avisos que constam desta publicação,consulte o apêndice “Translated Safety Warnings” - “Traduçõesdos Avisos de Segurança”).AdvertenciaEste símbolo de aviso significa peligro. Existe riesgo para suintegridad física. Antes de manipular cualquier equipo,considerar los riesgos que entraña la corriente eléctrica yfamiliarizarse con los procedimientos estándar de prevención deaccidentes. (Para ver traducciones de las advertencias queaparecen en esta publicación, consultar el apéndice titulado“Translated Safety Warnings.”)Varning!Denna varningssymbol signalerar fara. Du befinner dig i ensituation som kan leda till personskada. Innan du utför arbete pånågon utrustning måste du vara medveten om farorna medelkretsar och känna till vanligt förfarande för att förebyggaskador. (Se förklaringar av de varningar som förekommer i dennapublikation i appendix "Translated Safety Warnings" [Översattasäkerhetsvarningar].)Cisco SIP IP Phone 7960 Administrator Guidexiv78-10497-02

About This GuideObtaining DocumentationObtaining DocumentationWorld Wide WebYou can access the most current Cisco documentation on the World Wide Web athttp://www.cisco.com, http://www-china.cisco.com, orhttp://www-europe.cisco.com.Documentation CD-ROMCisco documentation and additional literature are available in a CD-ROMpackage, which ships with your product. The Documentation CD-ROM is updatedmonthly. Therefore, it is probably more current than printed documentation. TheCD-ROM package is available as a single unit or as an annual subscription.Ordering DocumentationRegistered CCO users can order the Documentation CD-ROM and other CiscoProduct documentation through our online Subscription Services Nonregistered CCO users can order documentation through a local accountrepresentative by calling Cisco’s corporate headquarters (California, USA) at408 526-4000 or, in North America, call 800 553-NETS (6387).Obtaining Technical AssistanceCisco provides Cisco Connection Online (CCO) as a starting point for alltechnical assistance. Warranty or maintenance contract customers can use theTechnical Assistance Center. All customers can submit technical feedback onCisco documentation using the web, e-mail, a self-addressed stamped responsecard included in many printed docs, or by sending mail to Cisco.Cisco SIP IP Phone 7960 Administrator Guide78-10497-02xv

About This GuideObtaining Technical AssistanceCisco Connection OnlineCisco continues to revolutionize how business is done on the Internet. CiscoConnection Online is the foundation of a suite of interactive, networked servicesthat provides immediate, open access to Cisco information and resources atanytime, from anywhere in the world. This highly integrated Internet applicationis a powerful, easy-to-use tool for doing business with Cisco.CCO’s broad range of features and services helps customers and partners tostreamline business processes and improve productivity. Through CCO, you willfind information about Cisco and our networking solutions, services, andprograms. In addition, you can resolve technical issues with online supportservices, download and test software packages, and order Cisco learning materialsand merchandise. Valuable online skill assessment, training, and certificationprograms are also available.Customers and partners can self-register on CCO to obtain additionalpersonalized information and services. Registered users may order products,check on the status of an order and view benefits specific to their relationshipswith Cisco.You can access CCO in the following ways: WWW: www.cisco.com Telnet: cco.cisco.com Modem using standard connection rates and the following terminal settings:VT100 emulation; 8 data bits; no parity; and 1 stop bit.– From North America, call 408 526-8070– From Europe, call 33 1 64 46 40 82You can e-mail questions about using CCO to [email protected] Assistance CenterThe Cisco Technical Assistance Center (TAC) is available to warranty ormaintenance contract customers who need technical assistance with a Ciscoproduct that is under warranty or covered by a maintenance contract.Cisco SIP IP Phone 7960 Administrator Guidexvi78-10497-02

About This GuideObtaining Technical AssistanceTo display the TAC web site that includes links to technical support informationand software upgrades and for requesting TAC support, usewww.cisco.com/techsupport.To contact by e-mail, use one of the following:LanguageE-mail [email protected] (Chinese)[email protected] (Japanese)[email protected] [email protected] North America, TAC can be reached at 800 553-2447 or 408 526-7209. Forother telephone numbers and TAC e-mail addresses worldwide, consult thefollowing web y/DirTAC.shtml.Documentation FeedbackIf you are reading Cisco product documentation on the World Wide Web, you cansubmit technical comments electronically. Click Feedback in the toolbar andselect Documentation. After you complete the form, click Submit to send it toCisco.You can e-mail your comments to [email protected] submit your comments by mail, for your convenience many documents containa response card behind the front cover. Otherwise, you can mail your commentsto the following address:Cisco Systems, Inc.Document Resource Connection170 West Tasman DriveSan Jose, CA 95134-9883We appreciate and value your comments.Cisco SIP IP Phone 7960 Administrator Guide78-10497-02xvii

About This GuideObtaining Technical AssistanceCisco SIP IP Phone 7960 Administrator Guidexviii78-10497-02

C H A P T E R1Product OverviewThis chapter contains the following information about the Cisco SIP IP phone: What is Session Initiation Protocol?, page 1-1 What is the Cisco SIP IP Phone 7960?, page 1-5 Prerequisites, page 1-12 Cisco SIP IP Phone Connections, page 1-13 The Cisco SIP IP Phone with a Catalyst Switch, page 1-16What is Session Initiation Protocol?Session Initiation Protocol (SIP) is the Internet Engineering Task Force’s (IETF’s)standard for multimedia conferencing over IP. SIP is an ASCII-based,application-layer control protocol (defined in RFC 2543) that can be used toestablish, maintain, and terminate calls between two or more end points.Like other VoIP protocols, SIP is designed to address the functions of signalingand session management within a packet telephony network. Signaling allows callinformation to be carried across network boundaries. Session managementprovides the ability to control the attributes of an end-to-end call.Cisco SIP IP Phone 7960 Administrator Guide78-10497-021-1

Chapter 1Product OverviewWhat is Session Initiation Protocol?SIP provides the capabilities to: Determine the location of the target end point—SIP supports addressresolution, name mapping, and call redirection. Determine the media capabilities of the target end point—Via SessionDescription Protocol (SDP), SIP determines the “lowest level” of commonservices between the end points. Conferences are established using only themedia capabilities that can be supported by all end points. Determine the availability of the target end point—If a call cannot becompleted because the target end point is unavailable, SIP determineswhether the called party is already on the phone or did not answer in theallotted number of rings. It then returns a message indicating why the targetend point was unavailable. Establish a session between the originating and target end point—If the callcan be completed, SIP establishes a session between the end points. SIP alsosupports mid-call changes, such as the addition of another end point to theconference or the changing of a media characteristic or codec. Handle the transfer and termination of calls—SIP supports the transfer ofcalls from one end point to another. During a call transfer, SIP simplyestablishes a session between the transferee and a new end point (specified bythe transferring party) and terminates the session between the transferee andthe transferring party. At the end of a call, SIP terminates the sessionsbetween all parties.Conferences can consist of two or more users and can be established usingmulticast or multiple unicast sessions.NoteThe term conference means an established session (or call) betweentwo or more end points. In this document, the terms conference andcall are used interchangeably.Cisco SIP IP Phone 7960 Administrator Guide1-278-10497-02

Chapter 1Product OverviewWhat is Session Initiation Protocol?Components of SIPSIP is a peer-to-peer protocol. The peers in a session are called User Agents(UAs). A user agent can function in one of the following roles: User agent client (UAC)—A client application that initiates the SIP request. User agent server (UAS)—A server application that contacts the user when aSIP request is received and that returns a response on behalf of the user.Typically, a SIP end point is capable of functioning as both a UAC and a UAS, butfunctions only as one or the other per transaction. Whether the endpoint functionsas a UAC or a UAS depends on the UA that initiated the request.From an architecture standpoint, the physical components of a SIP network canalso be grouped into two categories: clients and servers. Figure 1-1 illustrates thearchitecture of a SIP network.NoteIn addition, the SIP servers can interact with other applicationservices, such as Lightweght Directory Access Protocol (LDAP)servers, a database application, or an extensible markup language(XML) application. These application services provide back-endservices such as directory, authentication, and billing services.Cisco SIP IP Phone 7960 Administrator Guide78-10497-021-3

Chapter 1Product OverviewWhat is Session Initiation Protocol?Figure 1-1SIP ArchitectureSIP Proxy andRedirect ServersSIPSIPSIPSIP UserAgents (UA)SIP GatewayRTPPSTNLegacy PBX42870IPSIP ClientsSIP clients include: Phones—Can act as either a UAS or UAC. Softphones (PCs that have phonecapabilities installed) and Cisco SIP IP phones can initiate SIP requests andrespond to requests. Gateways—Provide call control. Gateways provide many services, the mostcommon being a translation function between SIP conferencing endpointsand other terminal types. This function includes translation betweentransmission formats and between communications procedures. In addition,the gateway also translates between audio and video codecs and performs callsetup and clearing on both the LAN side and the switched-circuit networkside.Cisco SIP IP Phone 7960 Administrator Guide1-478-10497-02

Chapter 1P

v Cisco SIP IP Phone 7960 Administrator Guide 78-10497-02 Contents Using the Cisco SIP IP Phone Menu Interface 2-21 Reading the Cisco SIP IP Phone Icons 2-22 Customizing the Cisco SIP IP Phone Ring Types 2-24 Creating Dial Plans 2-24 CHAPTER 3 Managing Cisco SIP IP Phones 3-1 Entering Configuration Mode 3-1 Unlocking Configuration Mode 3-2 Locking Configuration Mode 3-2