3com IP Telephony Acronyms

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TECHNOLOGY GUIDE

3Com IP Telephony Acronyms and Glossary

AAAuto-Attend a nt

ACDAutomatic Call Distribution

ADSLAsymmetric Digital SubscriberLine

AESAdvanced Encryption Standard

ANIAutomatic Number Identification

ANSIAmerican National StandardsInstitute (www.ansi.org)

APIApplication Programming Interface

ATMAsynchronous Transfer Mode

B2BUABack-to-Back User Agent

BRIBasic Rate ISDN

CASComplement Attendant Software

CDRCall Detail Reporting

CLI/CLIDCalling Line Identification

COCentral Office

CoSClass of Service

CRMCustomer RelationshipManagementCTIComputer Telephony Integration

DCADesktop Call Assistant

DESData Encryption Standard

DHCPDynamic Host ConfigurationProtocol

DID/DDI

Direct Inward Dialing/DirectDialing Inward

DiffServDifferentiated Services

DNISDialed Number IdentificationService

DSS/BLFDirect Station Selection/BusyLamp Field

DTMFDual-Tone MultiFrequency

E911Enhanced 911

E&MEarth and Magnet (signaling)

ETSIEuropean TelecommunicationsStandards Institute (www.etsi.org).

FXOForeign eXchange Office

FXSForeign eXchange Subscriber

HTTP

Hypertext Transfer ProtocolIEEEInstitute of Electrical andElectronic Engineering(www.ieee.org)

IETFInternet Engineering Task Force(www.ietf.org)

IMInstant Messaging

IMAPInternet Message Access Protocol

IPInternet Protocol

IPSIntrusion Prevention System

IPsecIP Security

ISDNIntegrated Services DigitalNetwork

ISOInternational Organization of Standardization (www.iso.org)

ITUInternational TelecommunicationUnion (www.itu.int)

IVRInteractive Voice Response

Kbps or Kb/sKilobits per second

KTSKey Telephone System

LANLocal Area Network

LCRLeast Cost Routing

Mbps or Mb/sMegabits per second

MIBManagement InformationDatabase

ModemModulator/Demodulator

MOSMean Opinion Score

MPLSMulti-Protocol Label Switching

NATNetwork Address Translations

NBX

Network Branch eXchange

NCPNetwork Call Processor

NOSNetwork Operating System

NPANumbering Plan Area

PABXPrivate Area Branch Exchange

PANPersonal Area Network

PBXPrivate Branch Exchange

PCIPeripheral ComponentInterconnect

POP3Post Office Protocol 3

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3COM IP TELEPHONY ACRONYMS AND GLOSSARY

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POTSPlain Old Telephone Service

PRIPrimary Rate Interface

PSTNPublic Switched TelephoneNetwork

QoSQuality of Service

RSVPReservation Protocol

RTPReal-Time Protocol

RTSPReal-Time Streaming Protocol

SDPSession Description Protocol

SIPSession Initiation Protocol

SIMPLE

SIP Instant Messaging andPresence Leveraging Extensions

SMDISimplified Message Desk Interface

SMDR

Station Message Detail Recording

SMTPSimple Mail Transfer Protocol

SNMPSimple Network Management

ProtocolSRTPSecure Real-Time TransportProtocol

TAPITelephony ApplicationProgramming Interface

TCP/IPTransmission Control Protocol/Internet Protocol

TLSTransport Layer Security

TSAPITelephony Server ApplicationProgramming Interface

UCDUniform Call Distribution

UDPUser Datagram Protocol

UMTSUniversal MobileTelecommunications System(www.umts-forum.org)

VCX

Voice Core eXchange

VLANVirtual LAN

VM/MSVoicemail/Messaging System

VoIPVoice over Internet Protocol

VPIMVoice Profile for Internet Mail

VTLVirtual Tie Line

W3CWorld Wide Web Consortium(www.w3.org)

WANWide Area Network

Wi-FiWireless Fidelity

WLANWireless LAN

XMLExtensible Markup Language

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3GThird-generation digital cellularmobile standard for deliveringhigh-speed data to mobile devices;will eventually deliver packet-based mobile communications asIP Multimedia Subsystem (IMS)architectures are implemented.

802.11a/b/gStandards for wireless networkingusing unlicensed radio spectrumfor Wi-Fi communications.

Abbreviated DialingAlso known as speed dialing,allows a list of frequently callednumbers to be stored in systemmemory and accessed via a two-

or three-digit code.Account CodesAllows a phone user to enter anaccount code that will appear in arecord of calls made or received;codes can be forced or unforced;optionally, they can be verifiedagainst an allowed code listdefined by an administrator.

Ad-hoc ConferenceConference bridge facility whereparties can call a number at any-time and be placed in conference,sharing a pool of conference portswith no guarantee of availability;unlike scheduled conferences withpre-booked resources; also knownat meet-me conferences.

Attendant ConsoleA standard telephony device thatshows the status of each extensionin a telephone system, allowing areceptionist to connect incomingcalls to the requested destination.

Authorization Codes (CoS Override)

Allows phone users to temporarilyoverride the configured Class of Service (CoS) on a phone andaccess additional services byusing their authorization code;usually enabled by entering ausers extension number and PIN.

Auto-Attendant (AA)An application that answersincoming calls with a menu of options; a recorded greeting maybe followed by a transfer to a liveattendant or station, or it may

provide dialing instructions forreaching certain users, departmentsor a live attendant.

Auto-Discovery

A feature that discovers a newtelephone or other device on thenetwork and provides it withservice without specific directionsfrom a system administrator.

Automatic Call Distribution (ACD)A call management system thatroutes calls to queues so they canbe answered by appropriatelyskilled agents. The ACD canmanage individual and groups of ACD agents, as well as recordedannouncements presented to

callers; the software also canprovide database reports on bothcalls and agents.

Automatic Hold RecallAllows calls to be placed on holdand recalls the called party if there is no response to the callwithin a specified period of time.

Auto-RedialA modem, fax or telephone fea-ture that redials a busy numbera fixed number of times beforedisconnecting.

Auto-RelocationA feature that allows a telephoneto keep its extension number andpersonal and systems settingswhen it is connected to a differentport on the network.

Back-to-Back User Agent (B2BUA)A device that follows the rules of the Session Initiation Protocol (SIP)

standard RFC3261for a useragent (client), but relays signalingto other clients or proxies; enables

comprehensive features to bedelivered to SIP clients withoutthe constraints of being a SIP proxy.

Basic Rate ISDN (BRI)Two-channel ISDN service usablefor voice or data (2 x 64 Kbps).

BitUnit of information within binarydata represented by one or zero.

BluetoothWireless standard for short-range,device-to-device communications

(www.bluetooth.com).

Bridged AppearanceAllows joint management of anextension by enabling specifiedphones to simultaneously share aline appearance; typically used inan executive/admin environmentwhere the admin can see, answerand manage calls made to multipletelephones.

BufferArea in a device for temporarystorage of data in transit; canaccommodate differences in pro-cessing speeds to facilitate a cleartransmission between devices bystoring data blocks until they areready to be processed by a slowerdevice.

Busy OverrideAllows users to override a busysignal to break into an existingconversation; most systems, butnot all, offer this feature with awarning tone that is given to allparties of a current conversation.

Call Accounting SystemUsually an external application toa telephony system which mergescall detail records with call costs,facilitating client and/or depart-

mental billing and helping verifytelephone company bills.

Call CoveragePre-configured routing for callswhich are unanswered by a calledextension or call forwardingrules; frequently configured tovoice mail.

Call Detail Record (CDR)Saved call information relating tonumber dialed, duration, etc..

Caller Identification

CLID (Calling Line IDentification):indicator on the phone receivinga call the callers name or phonenumber; Caller ID is a servicethat a local phone company orservice provider can offer thatdisplays a CLID.

ANI (Automatic Number Identi-fication): indicator of caller datadisplayed on the phone receiv-ing the call. When the call isrouted to a PBX via an ISDNtrunk from the public telephone

network, the callers phone

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number (ANI) is automaticallyprocessed for future reference.

DNIS (Dialed Number Identifi-cation Service): indicator of

data about the number calledthat is displayed on the callersphone. When the call is routedto it, the PBX processes theDNIS for display.

Call ForwardEnables users to arrange for callsto be sent to another phone indefined situations; can be imple-mented for: busy calls only no-answer calls

all calls fixed calls: forwards to anassigned location (generallycustomizable), such as a managerto an admin

override/return calls: allowsa call to override a forwardedcall and return it to the callforwarders phone

off premise calls: allows calls tobe forwarded off-site

Call ParkAllows users to transfer calls toParking or Orbit zones where thecalls remain on hold until pickedup at the same station or at anotherlocation.

Call Park (with Recall)An automatic function of somesystems that recalls either theoriginal phone or the attendantto ensure that the caller is notforgotten when a call is placed ina Park location for an extendedperiod of time.

Call Pickup (Directed, Group)Enables any user or a group of users to pick up a call ringing atan unattended station; one groupmember can dial an access code topick up a call ringing at an unat-tended members station.

Call WaitingAn indication to a user who isengaged on one call that anotheris trying to connect; a recordedmessage can be used to let thecaller know that the called useris being alerted.

Camp-On BusyAllows a caller to request an auto-matic callback from a busy exten-sion when that user is free.

Central Office (CO)Term used by service providersfor the site that houses theswitching equipment for theirpublic telephony services.

Circuit SwitchingA bandwidth allocation methodfor using a fixed portion of thenetwork and creating end-to-endconnections that are open duringthe full duration of the communi-cations session.

Class of Service (CoS)User profiles defined by a systemadministrator to restrict or allowaccess to specific features andcalling privileges and services.

CodecCoder/decoder for handling audiosignals over a data network; e.g.,G.711 and G.729.

Complement Attendant Software(CAS)A desktop call control applicationwith advanced features to improve

call handling for receptionists.Computer Telephony Integration(CTI)The integration of business appli-cations with voice systems throughspecialized software applications(middleware); applications includecontact center software whichwill manage call routing based onbusiness rules and enable viewingcaller information on a PC when acall is received.

Conference

Pre-scheduled or ad-hoc callswith multiple parties.

Desktop Call Assistant (DCA)On-screen dialing and contactmanagement software.

Direct Group CallingAllows users to call a group of stations such as a sales departmentby dialing a group code number.

Direct Inward Dial (DID)/DirectDialing Inwards (DDI)Connects calls from the public

network directly to the dialedextension without attendant

assistance, allowing easier andfaster access to called parties.

Directory Service (on LCD phones)Look-up functionality that allows

users to enter a name or set of characters on a phones keypad todisplay a needed phone number.

Distinctive RingingA system configuration that iden-tifies callers or their locations byunique ringing patterns; mayalso be combined with PersonalRinging.

Do Not DisturbA feature that prohibits calls fromterminating at a particular phone.

Do Not Disturb with OverrideA capability that allows author-ized users to override the Do NotDisturb feature and have theircalls ring the phone that is in DoNot Disturb mode.

Door PhoneAn intercom box or a combinationintercom box/electronic door lockthat can be installed on an outsidedoor and directly connected to aspecific phone or to the system.

Dual-Tone MultiFrequency (DTMF)SignalingA tone-based signaling systemthat can be used for initial dialingor leveraged to communicate to acall processing application afterthe initial call is established.Interactive voice response (IVR)systems may prompt the user toenter information via the dial padthat will be sent via DTMF tonesthat correspond to the key(s) thatwere pressed.

Dynamic Host ConfigurationProtocol (DHCP)Software that dynamically assignsIP addresses to network devicessuch as workstations, IP phonesand gateways, allowing networkdevices to be easily moved fromone subnet to another withoutadministrative attention.

E1European digital transmission for-mat that carries signals at 2 Mbps(32 channels at 64 Kbps, with 2channels reserved for signalingand controlling).

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E&M (Earth & Magnet) SignalingA legacy signaling system usedover two- and four-wire analogconnections.

Enhanced 911 (E911)An emergency system, basedon database information, thattransmits a callers phonenumber and location directlyto emergency responders.

EthernetThe most common local area net-work (LAN) technology, definedby the IEEE 802.3 standard, thatlets devices contend for accessto a shared network.

Executive Override of PrivacyAllows authorized users to overridethe privacy feature and join anexisting two-party conversation.

Extensible Markup Language(XML)A standard for storing and trans-mitting data between systems;allows data to be simply struc-tured and shared between data-bases and applications.

External Alerting DeviceExternal bells, lights or gongs that

can be placed in special locationsto facilitate the handling of calls.

External Page InterfaceConnections for an external loudspeaker able to page one or morezones.

Fax (Facsimile)Transmission of a document overtelecommunications channelsusing a modem or ISDN.

Fax MachineA device that converts a document

to a digital form suitable for sendingand receiving over telecommuni-cations systems and that allowsthe printing of a fax.

Flexible Station NumberingAllows users to customize theirown phone numbering scheme andfeature and trunk access codes.

Foreign Exchange Office (FXO)An interface that connects localcalls to a PSTN central office or toa PBX that does not support E&Msignaling.

Foreign Exchange Station (FXS)An interface that connects directlyto a standard analog phone, faxmachine or similar device, sup-plying ringing voltage, dial toneand similar signals to the end-point device.

Frame RelayA high-speed packet switchingprotocol in which unprocessedpackets are relayed from aswitchs input port to outputport: used for wide area network(WAN) connectivity.

GatewayA device that interconnects networkswith different, incompatible com-

munications protocols; specificallyused to connect VoIP networkswith analog phones, PBXs andPSTN trunks.

H.323A comprehensive standard of theInternational TelecommunicationUnion (ITU) for realtime voice andvideoconferencing (includingapplication sharing and white-boarding) over packet networks LANs, WANs and the Internet.

Hands-Free

A phone feature that allows usersto answer incoming calls using anintegral speaker and microphonewithout having to touch the phone.After a warning tone the phoneautomatically goes off-hook.

Hold (System, Exclusive)Allows users to put callers on holdso that they can answer or initiateanother call; calls can be placedon System Hold so that any otherstation user with the same lineappearance can pick up the call,

or they can be placed on ExclusiveHold so that only the station userwho put the caller on hold canaccess the call.

Hot Lines(or Manual Lines/House Phones)Allows a direct connection to beautomatically established toanother phone in the systemwhen a user goes off-hook.

Hunt GroupsA group of extensions accessedvia a single number and allowingcalls to be distributed to multiple

users, any of whom can answerthe calls. Users can usually login and log out of hunts groups.Administrators can determinebehavior with a variety of huntgroup types, including:

linear: starts with the sameextension in the group eachtime and continues ringing allthe phones in the group until auser answers, or the last phonehas been rung or a pre-deter-mined time is reached

circular: starts with ringing thenext number in the group foreach new call and continuesthrough the extensions in the

group until the call is answeredor a pre-determined time isreached

longest idle: rings the phone inthe group that has been withouta call for the longest time; con-tinues to the next shortest idleuntil answered or a pre-deter-mined time is reached

Hybrid ModeA PBX operating mode in whichsome outside lines are groupedtogether in pools while other linesare assigned directly to buttonson telephones; users access out-side lines by dialing a pool accesscode (see key mode).

Hybrid PBXA PBX that is able to support bothtraditional analog or digitalphones as well as IP phones.

I-Hold IndicationProvides multiline station userswith an indication as to whichholding line is the one that they

placed on hold.Internet Engineering Task Force(IETF)Organization responsible for themany Internet standards such asHTTP, SMTP and SIP.

Internet Message Access Protocol(IMAP4)A standard interface between anemail client and an email serverthat displays headers with to/fromaddresses and subject (rather thanentire messages) so that users can

selectively open and downloadtheir messages.

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Incoming Call GroupAllows central office trunk linesto be assigned to ring directly intoa group of stations without beingrouted through the attendant.

Interactive Voice Response (IVR)An automated system that caninteract with a caller, providingadditional services such as direc-tory lookup or call transfers bycollecting information throughDTMF or speech recognition;often used in front of contactcenters to collect customer specificinformation before connecting thecaller to an agent.

Internal Paging

Allows users to place page calls tocertain groups or all users on thesystem via the telephone speaker.

Intrusion Prevention System (IPS)An inline security system fordetecting and eliminating network-borne application or infrastruc-ture attacks; uses deep packetinspection to identify and blocktransmission of malicious softwaresuch as worms, viruses and trojanhorses.

IP TelephonyVoice services delivered over anIP network.

Integrated Services DigitalNetwork (ISDN)An international standard forswitched, digital voice and dataservices based on 64 Kbps circuits.

I-Use IndicationProvides multiline station userswith an indication of the line thatis currently in use.

JitterThe variation in latency (delay)for different packets to travel overa network; for real-time data suchas voice transmission, jitter mustbe kept to a minimum.

Key ModeA telephone system operatingmodel in which each telephonein the system has buttons for eachavailable outside line; also knownas a square plan or a direct systeminward access (DISA) system (seehybrid mode).

Key Telephone System (KTS)A standalone, inhouse telephonysystem (often with relatively fewusers) in which all lines aredirectly connected to the tele-phone company central office,allowing users to place outsidecalls without dialing 9 first;connected phones have buttonsfor contacting on-premises phonesas well as for making outside calls.

LAN TelephonyThe convergence of voice and datatraffic over a local area network.

LatencyThe sum of all the delays in anend-to-end connection on a net-

work transmission.Least Cost Routing (LCR)A call routing plan, similar to AutoRoute Selection (ARS) that usestime-of-day, day-of-week and digittranslation information to find theleast expensive routes for long-distance calls.

Local LoopThe analog component of thePSTN that connects subscribersto a service.

Main/Satellite ServiceInterconnectivity among multiplesystemssuch as those deployedin a business or school campusenvironmentprovided by specialtrunks that allow almost transpar-ent feature sharing with commonnumbering plans and access codes.

Manual SignalingAllows users to send a manualsignal or intercom tone to anotherphone by pressing a button.

Meet-me ConferenceConference bridge facility whereparties can call a number at any-time and be placed in conference,sharing a pool of conference portswith no guarantee of availability;unlike scheduled conferenceswith pre-booked resources; alsoknown as ad-hoc conferences.

Mean Opinion Score (MOS)A commonly used measurementof voice quality derived frommultiple callers rating call quality,

thereby creating the mean opinion;

can also be calculated from delay, jitter and packet-loss measurementsto give an approximate score. Ascore greater than 4.0 equates totoll grade (see QoS).

Message WaitingA feature that lights a message-waiting lamp to indicate receiptof a message (either voice- or text-based) from an attendant oranother phone user.

Modulator/Demodulator (Modem)A device that allows digital com-munication over circuits designedfor voice by converting the datato suitable analog signals.

Multiple Trunk Groups

Allows central office trunk linesto be assigned to pools or groupsin applications that require morethan one central office trunk linefor the same function.

Music-on-HoldAudio signals (music, advertisingor other sounds) that are playedto users on hold so that theyknow they are still connected.

MySQLAn open source database that isable to run under various versionsof UNIX, Windows and Mac sys-tems and is often used to storeand access provisioning systemand subscriber feature data.

Network-Branch eXchange (NBX )A registered trademark of 3ComCorporation that identifies an IPtelephony platform providing high-value converged services to smalland medium-sized organizations.

Network Call Processor (NCP)The heart of an IP telephony

system that takes signaling fromend points, such as phones andgateways, and forwards it to otherendpoints based on dialing plans,routing rules and feature settings;configured by an administrator toprovide the required IP telephonyfeatures.

Night ServiceAllows central office trunk linesto be assigned in a fixed or flexi-ble configuration to differentringing locations after normal

business hours.

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Off-HookThe state of a telephone that isready to receive dialing digits, inthe process of dialing or has a callin progress (in contrast with on-hook); though normally deter-mined by whether the handsetis off the cradle, with modernspeakerphones a device may gooff-hook automatically as thefirst digit is pressed or uponpressing a dial or send buttonafter entering digits. The termstems from the days when atelephone handset was hung ona hook.

Off-Premise ExtensionOften a single-line phone, an off-site device that provides a userwith the same capabilities andfeatures as on-site phones.

On-HookThe state of a telephone that isnot ready for dialing or is in theprocess of dialing and does nothave a call in progress (in contrastwith off-hook).

On-Hook DialingAllows station users to dial callswithout lifting the handset.

Outgoing Call RestrictionsAdministrator-defined limitationsplaced on users or extensionsthat prohibit numbers or numberranges; often used to block exter-nal or international calling.

Packet SwitchingA communications method thatbreaks-up data into small packets,routes them through the networkand then reassembles them at thereceiving end.

Personal RingingAllows users to program theirphones with personal ringingtones to distinguish one ringingphone from another; may also becombined with Distinctive Ringing.

Phantom MailboxA user profile that assigns a tele-phone number but without anassociated telephone and automat-ically connects all calls to its mailboxwithin a voicemail system.

Post Office Protocol 3 (POP3)Common protocol enabling emailclients to access email serversover an IP network.

Power Failure Transfer PhonesAllows specified central officetrunk lines to be connecteddirectly to certain phones in theevent of a system or commercialpower failure.

Primary Rate ISDN (PRI)Service provider connection thatdelivers up to 24 (T1) or 30 (E1)switched data channels to a site.Each channel supports voice or 64Kbps of data.

PrivacyProtects an existing conversationfrom accidental or intentionalinterruption by another user.

Privacy Release (Non-Privacy)Gives a phone user control of theprivacy feature, enabling itsrelease should the user want toallow another phone user withthe same line appearance to jointhe conversation.

Private Automated BranchExchange (PABX)(See PBX)

Private Branch Exchange (PBX)Also referenced as PABX, PrivateAutomated Branch Exchange, aninhouse telephony switching net-work that allows phones to beused for internal calls or calls tophones outside the network via agroup of shared PSTN trunks.PBXs can support analog or digi-tal services and capabilities suchas least cost routing for outsidecalls, call forwarding, conferencecalling and call accounting.

Private LinesAlso known as personal lines,enable assignment of a trunk lineto a specific button available onlyon certain telephones or to a spec-ified phone user.

ProtocolRules controlling communicationbetween devices (rather likegrammar in a language) for thepurposes of exchanging of infor-mation.

Proxy Server (SIP proxy)An intermediate device thatreceives requests from a clientand then initiates requests onthe clients behalf; a SIP proxyfollows the rules of the SessionInitiation Protocol (SIP)stan-dard RFC3261to relay SIPsignaling onto other proxiesor clients.

Public Switched TelephoneNetwork (PSTN)The name of the international net-work of circuit-switched, automatedtelephone exchanges governed byInternational TelecommunicationUnion standards.

Q.931Signaling protocol for interfacingwith service provider networksover a T1 or E1 connection.

Q.SIGAn open, standards-based protocolthat provides signaling and featureinteroperability between PBXs.

Quality of Service (QoS)Used to describe the characteristicsrequired by a network in order tohandle real-time communicationsand data applications simultane-ously. Voice and video need QoScharacteristics such as low delay,low packet loss and minimal jitterwhich are tolerated by most dataapplications.

Real-Time Protocol (RTP)An IP protocol for voice, videoand other real-time IP traffic thatprovides timestamping and syn-chronization information in thepacket header to ensure properreassembly when it reaches itsdestination.

Recorded MessagesAllows the system to connectcallers to a recorded announcementin conjunction with such featuresas Night Service, Station Hunting,Automatic Call Distribution andAuto Wakeup.

Remote AccessAllows specified users to dial intothe system from an outside locationand be permitted access to systemfeatures and outside lines.

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ReSerVation Protocol (RSVP)A communications protocol fornotifying a router that bandwidthneeds to be reserved for real-timeaudio and video traffic to enhancetransmission quality.

Saved Number RedialAllows a user to dial a number andsave it so that it can be redialed ata later time by pressing a buttonor dialing an access code.

Scheduled ConferenceA pre-scheduled, formal meetingconducted as a call between mul-tiple parties based on a predeter-mined participant list and/or ascheduled start and end time.

Screen PopA window that automatically openson a users computer when a pre-defined telephone event occurs;for example, an incoming callcould generate a screen pop thatlists caller ID information.

Session Description Protocol(SDP)An IETF protocol that definesa text-based message formatfor multimedia session requestsbetween IP devices using stan-dards such as Session InitiationProtocol (SIP).

Secure Real-Time TransportProtocol (SRTP)A protocal that provides confiden-tiality, message authentication andreplay protection and control of RTP traffic.

Security Alarm InterfaceAllows an alarm to trigger a tele-phone system alert whenever thedoor is opened.

Session Initiation Protocol (SIP)An IETF application layer, text-based protocol, based on HTTPand MIME, that is used to handlesession establishment betweenend points; enables interactivesessions to be established usingSDP to negotiate required mediasuch as text, voice or video.

SignalingIndicators that control transmis-sion of data or operation requests.

SIP Instant Messaging andPresence Leveraging Extensions(SIMPLE)IETF SIP enhancements thatprovide a standardized method

of delivering presence informa-tion and for supporting instantmessaging (IM).

Simple Mail Transfer Protocol(SMTP)A standard that defines the mes-sage format and transfer agent(MTA) needed for storing andforwarding emails using a varietyof encoding methods to enableplain text, executable programand multimedia attachments.

Simple Network ManagementProtocol (SNMP)A standard for sending messagesbetween a management systemand managed devices; includesthe ability to interrogate devicestatus and configuration, changeparameters and receive alarms.SNMP-compliant devices andagents store data about themselvesin management information bases(MIBs) and return this data to theSNMP requesters.

SIP Phone

An IP phone that uses SessionInitiation Protocol (SIP)-basedsoftware for handling calls.

Station Message Detail Recording(SMDR)Recording of data relating toincoming and outgoing calls thatenables phone activity reports tobe produced detailing time, dura-tion and number dialed (see CDR).

Station Queuing/Trunk Queuingwith CallbackAllows phone users who encounter

a busy line to put themselves in aqueue and go on-hook until calledback when the number they calledbecomes available (see camp-onbusy).

T1A standard network connection,predominantly in the U.S., thatcan handle 24 channels with eachchannel able to handle 64 Kbpsof data or a voice call. The totalcircuit operates at 1.544 Mbps.

T.38A standard for converting a faxtransmission from a circuit net-work to a packet network andvice versa.

TelephonyVoice communications.

Telephony Application Program-ming Interface (TAPI)Call control and call manipulationstandards developed by Microsoftand Intel for connecting computersto telephone services.

Tenant ServiceAllows more than one organization(tenant) to share the same telephonysystem; through programming,each tenant can be restricted toits own central office (CO) trunks,attendant consoles and extensionlinks; incoming calls are directedto the appropriate tenant.

Toll RestrictionPrevents specified phones fromlong distance toll calling (see out-going call restrictions).

Toll Restriction OverrideEnables authorized users to tem-porarily override toll restriction

assignments on a specific phoneby using a authorization codeor specific abbreviated dialingnumbers.

Traffic MeasurementEnables the system to generatefeature and utilization reports onsuch statistics as number of calls,duration of calls placed on differ-ent lines or the frequency that alllines are busy.

Transmission Control Protocol/Internet Protocol (TCP/IP)

The family of protocols thatsupports communications viathe Internet and most corporatenetworks.

Transport Layer Security (TLS)Enables signaling to be encryptedover the network.

TrunkA communications channelbetween two intermediate switchingpoints in a network; often used to

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refer to telephone channels betweenmajor switching centers or con-nections from a private networkinto a public network.

Trunk-to-Trunk ConnectionsAlso known as UnsupervisedConference, allows a user toestablish a connection betweentwo outside lines without needingto remain in the conversation.

Unified MessagingProvides access from a single inter-faceeither a PC or phonetovoice, fax and email exchanges.

User Datagram Protocol (UDP)Connectionless, unreliable trans-port protocol used over IP whereerror recovery is not required oris handled at a higher layer. Oftenused to carry RTP.

Virtual Tie LinesEnable private connectionsbetween two or more telephonysystems (two business sites) overan IP network.

Voice Core eXchange (VCX )A trademark of 3Com Corporationthat identifies a SIP-based IPtelephony platform providinghigh-value converged servicesto distributed organizations of any size.

Voicemail/Messaging System(VM/MS)A standalone or networked systemfor receiving, storing and forward-ing recorded voice messages.

Voice over Internet Protocol (VoIP)A technology that leverages IPdata networks for transportingvoice calls.

Voice Profile for Internet Mail(VPIM)A standard that enables software-based, seamless messaging betweenmultiple sites and multiple voicemessaging systems.

Voice SynthesizerAn electronic or software-basedsystem that can generate voiceprompts or messages by simulatinga human voice.

Volume Control (for Microphone)Allows adjusting the outgoingvolume of a phones microphoneon a hands-free call.

Volume Control(for Speaker/Ringer)Allows adjusting the volume of the incoming call ringer and thephones speaker.

Wi-Fi HotspotA location providing access to awireless LAN or the Internet.

Wi-Fi PhoneA wireless handset that uses the802.11 standards to allow mobiletelephony using Wi-Fi hotspots.

TW

Visit www.3com.com for more information about 3Com secure converged network solutions.3Com Corporation, Corporate Headquarters, 350 Campus Drive, Marlborough, MA 01752-30643Com is publicly traded on NASDAQ under the symbol COMS.

Copyright 2006 3Com Corporation. All rights reserved. 3Com, the 3Com logo and NBX are registered trademarks of 3Com Corporation. VCX is a trademark of 3Com Corporation. All other company and product names may be trademarks of their respective companies. While every effort is made to ensure the information

given is accurate, 3Com does not accept liability for any errors or mis takes which may arise. All specifications are subject to change without notice. 200251-004 05/06

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3com IP Telephony Acronyms