• Glossary

    A

    • Abandoned Call

    • A call which voluntarily hung–up before being answered.

    • Abbreviated Dialing

    • A feature providing station users access to system, group or personal lists allowing them to dial frequently called telephone numbers using a 1- to 3-digit code. System and Group lists may also be configured as 'privileged', thus overriding any restrictions placed on an extension.

    • Access Code (ACOD)

    • A numerical value in the programming of each route that when dialed can access the trunks in that route directly.

    • Access Security Gateway (ASG)

    • A security system available to Avaya Communication Servers which use one-time challenge/response authentication and a hand-held ASG Key device to protect access to the administrative interface of the Communication Server.

    • Active (Coverage Paths)

    • A state where a user is on the phone and the instrument is capable of receiving another call on an additional call appearance button.

    • Adaptation

    • A software module which allows Session Manager to perform modifications to SIP messages as they arrive at or leave SIP Entities. Modifications include traditional digit manipulation, as well as the ability to alter SIP headers. Modification of the SIP message headers facilitates third-party integration.

    • Administration Terminal

    • A device by which one can enter commands into a Communication Server.

    • All Trunks Busy (ATB)

    • The number of times during a given hour that all of the Trunks in a Trunk Group were busy. A review of the "Overflow Calls" for that Trunk Group may indicate simultaneous calls in excess of the number of trunks which may, or may not, have been completed. See Overflow Calls.

    • Attendant Administration Access Code

    • An additional password that allows an attendant to modify features assigned to telephones by using the Attendant Console as a system terminal.

    • Audit Trail

    • A text file kept by the Communication Server of all Log-In attempts and the Loads that were accessed.

    • Audix

    • Avaya's voicemail platform for the Definity Call Servers.

    • Authorization Code

    • A code that a user may dial before placing a call to modify their station's access restriction, usually to elevate their calling permissions. For example, you may require an Authorization Code before dialing international numbers to restrict their use.

    • Automatic Call Distribution (ACD)

    • A single number that may be dialed to present calls to multiple sets known as ACD Agents.

    • Automatic Circuit Assurance (ACA)

    • A feature which can monitor the holding times of trunk calls and notify personnel to unusually long or short call durations. This feature is often used to diagnose trunk malfunctions and highlight potential unauthorized use.

    • Automatic Number Identification (ANI)

    • Digits that are passed to the system with an incoming call indicating the source of the call, for example, the calling party billing number or the extension number for an internal call.

    • Automatic Route Selection (ARS)

    • A feature within the Communication Server which directs outbound calls to predefined Trunk Groups dependent upon the digits that were dialed.

    B

    • Bandwidth

    • The rate at which successive packets of data can be transmitted over an IP network. Bandwidth is measured in kbps (thousands of bits per second), Mbps (millions of bits per second), or Gbps (billions of bits per second).

    • Basic Automatic Route Selection (BARS)

    • Once programmed, the capability of the Communication Server to place outgoing calls over specific Trunk Routes through an analysis of the digits dialed.

    • Blocked/Overflow Calls

    • The percent of call attempts presented to a Trunk Group which were blocked due to all of the trunks being busy. If the Trunk Group is part of a Route list, these calls would have been presented to the next Trunk Group in that list. If not, a busy would be returned to the caller.

    • Blocking

    • Should there be insufficient time slots to complete a call, the Communication Server will increment a Blocking count. Ideally, there should be no Blocking within a system.

    • Bouncing Busy Hour

    • To project the heaviest traffic for a given period, the Bouncing Busy Hour concept seeks out the heaviest traffic within any given hour regardless of the day in which that hour occurred. For example, in attempting to show the heaviest traffic by hour of the day over a 5 day study, the 9 AM hour might be from Wednesday, while the 10 AM hour might be from Monday.

    C

    • Call Admission Control (CAC)

    • A feature allowing call rejection during the routing process. Rejection is based on predefined limits of maximum allowable bandwidth or maximum number of calls. The purpose of CAC is to maintain the fidelity of audio and video transmissions that have already been established. Ideally, the rejected call would be re-routed over an alternate facility.

    • Call Detail Recording (CDR)

    • A log of statistics about the calls handled by a Communication Server, including call duration, destination number, date and time, etc.

    • Call Detail Recording (CDR)

    • An ability of the Communication Server to capture and print the details of incoming and/or outgoing call attempts. Typically used for internal cost allocation purposes.

    • Call Forward All Calls Control

    • Determines whether the calling party's or the forwarding party's restrictions are used in the completion of a forwarded call.

    • Call Forwarding External

    • Allows a user to forward incoming calls to a number external to the switch.

    • Call Forwarding to a Trunk Access Code

    • This feature allows or denies the ability to forward calls to a Trunk Access Code.

    • Call Pickup Groups

    • A collection of sets that are able to answer calls made to any set within the same group.

    • Calling Party Restriction (CPR)

    • A setting within each Class of Restriction (COR) which allows or denies certain types of calls. For example, CORs with a CPR of "none" have no restriction, while CORs with a CPR of "outward" are not able to make any external calls.

    • CC-TTR

    • Abbreviation for a Touch-Tone Receiver Call Classifier used for call vectoring.

    • CCS

    • A unit of time equal to 100 seconds. To convert CCSs to minutes, multiply by 100, then divide by 60.

    • CFXA

    • A class of service (CLS) allowing calls to be forwarded off-premise. (Call Forward External Allowed)

    • Class of Restriction (COR)

    • Individual configurations of restrictions and permissions that control call origination and termination capabilities.

    • Class of Service (CLS)

    • A broad restriction class within the Communication Server that defines general calling capabilities. Actual calling capabilities of any station are further impacted by several additional parameters.

    • Class of Service (COS)

    • Assignments that determine certain calling options and features available to the telephone.

    • Class of Service Groups (COS Groups)

    • A feature of Communications Manager 5.1 and up, COS Groups allow you to have up to one hundred sets of sixteen COSes each. COS Groups are assigned to Tenants.

    • Code Restriction

    • A means by which calling to specific Area Codes may be allowed or denied.

    • Codec

    • An algorithm that encodes and decodes a data stream for transmission over a network or storage to persistent media. In the encoding and decoding process, data compression/decompression techniques can be applied to reduce the apparent amount of data transported by the network or stored.

    • Common Equipment

    • The section of the Communication Server housing cards not associated with sets or lines, i.e. CPU, Memory, Software, and Storage devices.

    • Control Circuit Packs

    • The circuit packs, or 'cards', not associated with stations or trunks, i.e. CPU, memory, software, and storage devices.

    • Control Directory Numbers (CDNs)

    • Special DNs to be used with the Enhanced ACD Routing (EAR) feature to add alternate RAN and Music treatments to an ACD queue.

    • Controlled Class of Service

    • A feature that allows 'Controllers' the ability to modify a station's Class of Service.

    • Coordinated Dialing Plan

    • Allows a customer to share a dialing plan among two or more Communication Server locations.

    • Coverage Answer Group

    • A group of up to 8 stations which act as an answer point for selected incoming calls. All phones in a Coverage Answer Group will ring simultaneously.

    • Coverage Path

    • A Coverage Path describes both the conditions under which incoming calls may be redirected and how they will be redirected.

    • Coverage Point

    • One of up to 6 answer points within a Coverage Path.

    D

    • Delayed Call

    • A call to an attendant group which was not immediately answered, but rather placed in queue waiting for an available attendant. Also known as a Queued Call.

    • Dial Intercom Group

    • A collection of sets that have the ability to call each other by using 1 or 2-digit dialing.

    • Dial Pattern

    • A Dial Pattern allows Session Manager to route calls based on the dialed digits and originating Location. Calls matching the Dial Pattern can either be routed according to the pattern's assigned Routing Policies, or they can be explicitly denied.

    • Digit Manipulation

    • The ability of the Communication Server to insert or delete leading digits of a dialed number.

    • Digital Signal Processor (DSP)

    • Hardware in the Communication Server that is responsible for translating between IP-based and non-IP-based (TDM) resources, echo cancellation, and call progress monitoring.

    • Direct Access

    • The ability for a station or trunk user to dial a Trunk Access Code (TAC) and receive dial-tone directly from a trunk, thus bypassing any restrictions of ARS.

    • Direct Inward System Access (DISA)

    • Permits callers to directly access the Communication Server from the public network by dialing a special number. Once connected, the caller takes on all of the capabilities of an internal caller.

    • Directory Number (DN)

    • An extension assigned to a set. This information is stored in the Directory Number Block (DNB).

    • Domain (Name)

    • A domain name is a human readable identification string with a hierarchical structure that defines a realm of authority within an IP network. Its structure follows the guidelines defined for the Domain Name System (DNS). For example, the domain name "sip.some-company.com" has three levels, and might be used to identify the realm of SIP resources within a company.

    • Domain Name System

    • The Domain Name System (DNS) is a hierarchical, distributed naming system used to organize and interconnect computers within an IP network. Each Domain name can be mapped to an IP address that identifies a specific 'device' by querying a Domain Name Service.

    • DND/SAC

    • Do Not Disturb/Send All Calls - A feature allowing a user to temporarily deny their station the ability to receive incoming calls.

    • DS1

    • Refers to a digital signal trunking facility, e.g., T1.

    • DTMF

    • Acronym for Dual Tone Multi-Frequency, describing the tones generated and detected when using the keypad of a telephone. Also known as touchtone.

    • DTR

    • A port within the Communication Server which provides the various tones and signals for the system.

    E

    • E.164

    • The E.164 standard is a recommendation that defines both the international numbering plan used in the PSTN, as well as the format of the telephone numbers themselves. E.164 numbers can have a maximum of fifteen digits and are usually written with a "+" prefix.

    • Embedded LAN (ELAN)

    • An isolated network that keeps critical telephony signaling between the Call Server and the other components separate from the media and data networks. This separation facilitates higher quality voice communications.

    • Erlang B

    • A probability formula used for determining trunking requirements for strictly outgoing Trunk Groups, where excess calls are not queued but rather blocked or overflowed.

    • Erlang C

    • A probability formula used for determining trunking requirements for incoming or two-way Trunk Groups, where excess calls may be queued.

    • Extension

    • A dialable number assigned to a station, data module, hunt group, terminating extension group, vector, etc.

    • External Number

    • When used in this audit, an 'external number' refers to a sequence of at least seven digits beginning with an AAR, ARS, or Trunk Group Access Code. These calls will potentially hit the public network and incur toll expenses.

    F

    • Facility Restriction Level (FRL)

    • An FRL is assigned to each Class of Restriction (COR) and is used to allow or deny access to specific Trunk Groups. An FRL of 0 is the most restrictive, while 7 is the least restrictive and can commonly access more facilities.

    • Facility Test Call

    • A feature which allows a technician to place calls directly to specific trunks or phones for testing and problem diagnosis, bypassing the normal permission restrictions.

    • Failed Log-In Threshold

    • The number of incorrect passwords that may be entered at the Administration Terminal before the Communication Server disables access for a specified period of time.

    • FAX on Demand

    • Allows callers to request pre-defined faxes to be sent to them using a call-back delivery method.

    • Feature Access Code (FAC)

    • A one to four digit code dialed by a user to activate a particular feature. For example, an administrator could define '*12' be used to activate the Call Park feature.

    • Flexible Feature Codes

    • User defined codes that activate select station features.

    • Forced Charge Account

    • A weaker form of Authorization codes in that the actual code is not authenticated, just the number of digits.

    • FQDN

    • A Fully Qualified Domain Name (FQDN) is a domain name that specifies the exact position of a resource in the Domain Name System (DNS) hierarchy.

    • Forwarding

    • A feature that directs the completion of an incoming call should the dialed number not answer.

    • Free Call Area Screening (FCAS)

    • A table in the Communication Server that allows tandem calls to reach only those Area Codes and Exchanges that will not incur toll charges.

    G

    • Grade of Service

    • See Service Objective.

    • Grading

    • The balanced assignment of terminals (Stations, Trunks, etc.) across available Carriers in order to evenly distribute traffic and assignment of facilities among all Carriers within the system.

    H

    • H.323

    • H.323 is a specification that defines a set of protocols to provide audio-visual communication sessions on a packet switched network.

    • History File

    • A text file kept by the Communication Server of all interactions with all administrative terminals.

    • Hunt Group

    • Allows a call to a busy extension to be redirected to an idle extension within the group.

    • Hunting

    • A feature that directs the completion of an incoming call should the dialed number be busy.

    I

    • IETF

    • The Internet Engineering Task Force is a standards body that develops, maintains and promotes protocol standards for the Internet (e.g. TCP/IP). The ITEF mission is to make the internet work better by influencing its design, use, and management.

    • INADS Port

    • Initialization and Administration System Port - A port on the Communication Server which provides remote administrative access to Communication Server programming.

    • Incoming DID Digit Conversion

    • A feature that enables the Communication Server to convert incoming DID digits and redirect calls to an internal DN.

    • Incoming Trunk Group Exclusion

    • A feature that blocks calls from an incoming trunk group from accessing specific Area Codes, Exchanges or other facilities that would circumvent restrictions at their home location.

    • Intercom Group

    • A grouping of stations that have the ability to call each other by using a 1 or 2-digit code.

    • InterLoop

    • Traffic between two terminals assigned to two different equipment Loops

    • Internet Protocol (IP)

    • A widely adopted protocol for transmitting data across a packet switched network, including the Internet.

    • IntraLoop

    • Traffic between two terminals assigned to the same equipment Loop.

    • IP Network Region

    • A logical grouping of IP based devices that should share configuration information, such as which Codecs to prefer, what Location they belong to, and what Networking domain they use.

    • IP Telephony Node

    • A logical grouping of Voice Gateway Media Cards and Signaling Servers. IP Telephony Nodes provide organization to and management structure for IP telephony deployments.

    J

    • Junctor

    • A Junctor links two Network Groups together such that any terminal in one Network Group may communicate with any other terminal in the other Network Group.

    L

    • Least Cost Routing

    • Least Cost Routing is a design in which calls are dynamically routed to different resources based on the costs that placing the call would incur. Typically, cost varies by time of the day or day of the week. Thus, Time-of-Day routing is often used to implement Least Cost Routing and is somewhat synonymous, although it has other uses.

    • Level 1 Password

    • A valid Level 1 Password allows the modification of all Communication Server items except passwords, Authorization Codes and DISA settings.

    • Level 2 Password

    • A valid Level 2 Password allows the modification of all Communication Server items including passwords, Authorization Codes and DISA settings.

    • Limited Access Passwords

    • Level 1 passwords that are further restricted in their capabilities in that they may be denied access to specific Loads in the Communication Server.

    • Load(s)

    • Programs in the Communication Server designed to perform specific functions.

    • Local Area Network (LAN)

    • A network that is internal to your organization. A LAN is viewed as a private resource with restricted access.

    • Location

    • A logical division of Communication Server resources, usually along geographic boundaries. Locations can also contain NPA information to aid in efficient and cost effective call routing.

    • Lockout Time

    • The amount of time after which an access port is automatically re-enabled after being disabled due to unsuccessful attempts to gain entry to the system.

    • Log-In Name

    • Used in conjunction with Level 1 and Level 2 passwords, a valid Log-In Name and then a valid password can be required to gain access to the system.

    • Loop

    • A set of equipment within the Communication Server shared by a finite number of terminals, with finite traffic carrying capacity.

    • LWC Reception

    • A setting within station programming which tells the Communication Server where Leave Word Calling information will be stored.

    M

    • Mailbox

    • An electronic storage repository for voice mail messages.

    • Manned Minutes

    • The total number of minutes within an hour that a console is open and capable of receiving calls. Manned Minutes cannot exceed 60 for any console in any one hour.

    • MARP

    • Multiple Appearance DN Redirection Prime - MARP is an attribute of DN appearances that affects call redirection features (e.g. CFW). Each DN can only appear 'MARPed' on a single TN. Other appearances of that DN are therefore unMARPed. The TN on which a DN is MARPed is the TN whose call redirection programming takes precedence when there is an ambiguity or conflict.

    • MMA

    • A Class of Service (CLS) used for Call Pilot Voicemail ports. (Multimedia Allowed)

    • Multi Customer

    • A single Communication Server may be divided in software to act as any number of separate systems (up to 100 customers). Hardware is shared but the database is not.

    N

    • NETCON Port

    • A NETwork CONtrol data module which provides administrative access to the Avaya Communication Server.

    • Network Attendant Service

    • Allows Attendant services to be distributed throughout a network.

    • Network Automatic Route Selection

    • Extends the Basic Automatic Route Selection capability to operate over a multi-location corporate network.

    • Network Class of Service (NCOS)

    • A numerical value representing an individual restriction level assignment for sets and trunks. Each NCOS corresponds to a Facility Restriction Level (FRL).

    • Network Group

    • A Network Group consists of 32 Loops, each with 30 time slots. The maximum size of a Meridian 1 or Communication Server 1000 is eight groups totaling 256 Loops.

    • Network Translation

    • Tables within the Communication Server that determine which Route List is to be used to route calls to a particular number.

    • New Flexible Code Restriction

    • An enhanced means by which calling to specific telephone numbers may be allowed or denied.

    • Night Service

    • A Communication Server feature that allows for the re-directing of in-ward calls to a console after normal business hours.

    O

    • Operations Support System (OSS)

    • An alarm monitoring and notification system in the Avaya Communication Server that can inform personnel of unusual system events.

    • Overflow Calls

    • The number of call attempts presented to a Trunk Group which were blocked due to all of the trunks being busy. If the Trunk Group is part of a Route List, these calls would have been presented to the next Trunk Group in that list. If not part of a Route List, a busy would be returned to the caller.

    P

    • P.0x

    • An abbreviation for the specification of a service objective. P.01 indicates a .01 service objective. See Service Objective.

    • PBX

    • Private Branch eXchange - A private telephone system which provides connectivity and switching functionality for an organization.

    • Peg

    • A simple stroke count of events; in most cases those events are calls.

    • Peripheral Equipment

    • The section of the Communication Server housing cards directly associated with sets and lines, i.e. Digital Line Cards, Universal Trunk Cards, and Voicemail.

    • Personal Class of Service

    • A Personal Class of Service has all of the parameters of Meridian Mail's system Classes of Service, but a Personal Class of Service applies to only one mailbox.

    • Personal Station Access (PSA)

    • A feature which allows a user to associate their telephone programming with another station of the same type. This allows the user to move their programming from one phone to another. Similar to the TTI feature used by technicians.

    • Pickup Group

    • A group of stations that are able to answer calls to any of the stations within the same group.

    • Poisson

    • A probability formula used for determining trunking requirements for Trunk Groups in which excess calls may be queued, but maximum holding times are fixed.

    • Port Address

    • An alphanumeric value corresponding to a specific card and port within the Communication Server. Every trunk, station and voicemail port has a specific and unique Port Address.

    • Port Circuit Packs

    • The circuit packs, or 'cards', associated with stations and trunks, e.g. Digital Line Cards, Analog Trunk Cards, DS1 Interfaces, and Audix Voicemail.

    • Port Network Links are the connections between multiple Port Networks enabling any station or trunk to connect to any other station or trunk within the system.

    • Port Network

    • Each station and trunk is connected to a Port Network which provides common call processing functions. Systems are expanded by adding additional Port Networks and linking them together.

    • Port

    • The physical location of terminal equipment using the addressing scheme of Cabinet, Carrier, Slot, Port.

    • Prime DN (PDN)

    • The DN assigned to Key 0 of a digital set, or the DN of an analog set.

    • Privilege Group

    • A collection of sets with identical calling abilities.

    • Privileged

    • A setting within the programming of System and Group Abbreviated Dialing Lists which allows all programmed entries to be dialed, regardless of the originating station's COR.

    R

    • Redirection Numbers

    • Any number, either internal or external, that is referenced by a feature whose purpose is to redirect the termination of a call.

    • Regrade

    • The reassignment of terminals from one Loop or Port Network to another to balance traffic between all facilities within the system.

    • Regular Expression

    • A Regular Expression allows Session Manager to route calls based on the call's Request-URI. Matching calls can either be routed according to the Regular Expression's assigned Routing Policies, or they can be explicitly denied. Regular Expressions have the ability to match complex alphanumeric patterns, and are thus more expressive than Dial Patterns.

    • Remote Access

    • A feature which allows off-site personnel to dial into the Communication Server and use the facilities of the Communication Server as if they were on-site. This feature is often used by traveling employees who need to make business calls from a distant location.

    • Remote Call Forwarding

    • Allows users to remotely change the destination of Call Forwarded calls.

    • Request-URI

    • For a SIP call, the Request-URI indicates the user or service to which the request is addressed. It follows the general format of 'user_handle'@'some.domain.com'. More information about the format of a SIP Request-URI can be found in the IETF RFCs 3261 and 2396.

    • Restrict Call Forward Off Net

    • A setting within a Class of Service (COS) which when set to 'n' allows calls to be redirected off-premise (externally).

    • Restricted Call List (RCL)

    • A listing of dialed numbers that may not be accessed by CORs with the 'Restricted Call List?' set to 'y'.

    • Restriction/Permission Lists

    • Tables that define the dialing digits that are either allowed or denied when using the features of Meridian Mail.

    • Revert DN

    • Calls that are presented to a mailbox may be re-directed to another number through use of the revert DN feature.

    • Route

    • A grouping of similar Trunks performing an identical purpose. For example, all DID Trunks for the main telephone number would be part of a single Route.

    • Route Lists

    • Frequently, more than one Trunk Route can complete a call to a given telephone number. The Route List specifies the order in which Trunk Routes are to be sought.

    • Route Pattern

    • A list of Trunk Groups to be used when calling specific numbers (i.e. Area Codes).

    • Routing Control

    • A schedule which alters Route List assignments by time of day.

    • Routing Policy

    • A Routing Policy specifies a SIP Entity destination, and the Time-of-Day parameters for routing calls to that destination. By linking Dial Patterns and Regular Expressions to a Routing Policy, you define which calls Session Manager will route to its destination, and the relative preference of sending those calls to that destination.

    S

    • SAT

    • Communications Manager System Administration Terminal. The primary interface by which one configures the telephony data in an Avaya Switch.

    • Scheduled Access Restriction

    • The ability to change the Access Restrictions of a group of stations and/or trunks on a scheduled basis.

    • Secure Data Password

    • An additional password that allows access to the database that controls Authorization Codes and the Direct Inward System Access features.

    • Secure Modem

    • A special type of modem that requires the entry of a password before allowing a caller to communicate with the Communication Server.

    • Secured Messaging

    • A system-wide feature that prevents users from being able to access their mailbox from an off-site telephone.

    • Security Banner

    • A textual security warning message displayed during any successful attempt to log into a system.

    • Security Violation Notification

    • A system for monitoring and reporting invalid attempts to access some resource of the Communication Server. For example, one can enable notifications for invalid Login Names, Barrier Codes, or Station Security Codes. A threshold of invalid attempts is defined for each type of notification, and the Communication Server can notify personnel when the threshold is exceeded.

    • Service Objective

    • The statistical probability of receiving a busy signal for a given volume of traffic presented to a given number of trunks. For example, a Service Objective of .02 would indicate a sufficient number of trunks such that no more than 2 busies out of a theoretical 100 call attempts would be incurred during a given hour.

    • Servicing Minutes

    • The number of minutes an operator is actually engaged in processing telephone calls. Since all measurements are hourly, the number of Servicing Minutes can not exceed 60 for any operator for any one hour.

    • Session Initiation Protocol (SIP)

    • SIP defines a set of protocols to provide call setup, tear down, and modification for multimedia communication sessions on an IP network.

    • Session Manager

    • Session Manager is a SIP-based software session management and routing application. It provides a centralized point to define enterprise-wide routing. This enables converged communications, and improvements in scalability and redundancy.

    • Set Relocation Security Code

    • A code required to activate the Set Relocation feature of a Communication Server.

    • Set Type

    • A field in the programming of each station designating a specific model of terminal equipment.

    • Silence Suppression

    • When encoding voice communications into IP packets, silence is not encoded and transmitted as part of the voice traffic data. This reduces the overall bandwidth requirements on an IP network, and is an optional feature that may be enabled. Silence Suppression is also referred to as VAD (Voice Activity Detection).

    • SIP Entity

    • SIP Entities are Session Manager's software representations of the major components that make up the Avaya Aura SIP Network. e.g. Session Managers, Communication Managers, Session Border Controllers, SIP trunks, etc. The routing rules of Session Manager specify that calls of a certain pattern should be directed to a particular SIP Entity.

    • Software Release

    • A naming convention defined by the manufacturer and used to keep track of software.

    • SourceBook

    • A documentation of the assignments and configuration of a Communication Server, taken directly from the system.

    • Special Prefix Code

    • A system defined code that is used to activate select station features.

    • Special Prefix Number (SPRE)

    • The DN that can be used by any station with MTA as a Class of Service (CLS) to log into the Communication Server and perform certain maintenance functions.

    • Speed Call Lists

    • A form of abbreviated dialing whereby a number may be called by the dialing of a code instead of its complete number.

    • Speed of Answer

    • The average amount of time a delayed call must wait before being answered by an attendant. Speed of Answer is a sum of the time a call spent in queue, plus the Speed of Response.

    • Speed of Response

    • The average amount of time a call must wait before being answered by an attendant, once the call was the next available call to be answered. It answers the question, "How quickly does the operator(s) respond to the indication of an incoming call?" High Answer times, but low Response times, may indicate an insufficient number of consoles.

    • Station Control Password

    • A special password that is required to invoke or disable specific features on a station, such as Remote Call Forwarding.

    • Station Designator (DES)

    • A free-form field in the programming of each set often used for location or identification purposes.

    • Station Speed Call

    • A feature providing station users the ability to dial frequently called telephone numbers using a 1 to 3-digit code.

    • Station Type

    • A field in the programming of each station designating a specific model of terminal equipment.

    • Superloop

    • A grouping of four loops, totaling 120 usable timeslots for call traffic.

    • System Speed Call

    • A feature providing station users access to a system-level list allowing them to dial frequently called telephone numbers using a 1 to 3-digit code. System Speed Call also overrides any restrictions placed on an extension.

    T

    • Tail End Hop Off (TEHO)

    • Tail End Hop Off is a cost-saving design in which calls are routed such that they stay on the flat-rate enterprise network as long as possible before 'hopping off' to the more expensive PSTN. This design can reduce or eliminate long distance charges when internal users call public numbers that are local to an existing facility on the enterprise network.

    • Tenant Partition

    • A logical grouping of resources within the Communication Server. Different companies sharing a common Communication Server might be placed into different tenants, or different departments within a single company.

    • Tenant Partition

    • A logical grouping of resources within the Communication Server. Different companies sharing a common Communication Server might be placed into different tenants, or different departments within a single company.

    • Terminal Number (TN)

    • A number corresponding to a specific port in the Communication Server. Every trunk, set, and voicemail port has an individual TN.

    • Terminal Translation Initialization (TTI)

    • A feature which allows a technician to move a user's telephone programming from one station to another. Similar to the Personal Station Access (PSA) feature.

    • Terminal

    • Any port within the system, usually meant to refer to a station or trunk.

    • Time-Division Multiplexing (TDM)

    • Refers to the legacy digital and analog technology responsible for transferring signals within a Communication Server before the introduction of IP-based telephony.

    • Time-slot

    • In a Time Division Multiple Access (TDMA) schema, the portion of the shared medium available to a single user.

    • Toll Abuse

    • The action of making unauthorized billable calls through a Communication Server.

    • Toll List

    • A listing of dialed numbers to toll calling areas.

    • Tone Receiver

    • A general term for the tone detecting and generating hardware in the Communication Server, which handle touch tones and call progress tones.

    • Transport Layer Security (TLS)

    • A cryptographic protocol that provides secure communications at the transport layer of an IP network.

    • Trunk Group

    • A collection of similar Trunks performing an identical function. For example, all DID Trunks for the main telephone number would be members of a single Trunk Group.

    • Trunk Access Code (TAC)

    • A dialable code assigned to each Trunk Group which provides direct access to the group, bypassing ARS.

    • Trunk Access Restriction Group (TARG)

    • A list of TGAR values which are denied access to a given route.


    • Trunk Group Access Restriction (TGAR)

    • A numerical value that controls access to the exchange network, TIE trunks, CCSA trunks, and paging and dictation services. TGAR is checked against the TARG of a route. If the two numbers match, the call is denied.

    • Trunk Group

    • A collection of similar trunks performing an identical function. For example, all DID trunks for the main telephone number would be members of a single Trunk Group.

    • Trunk ID (TKID)

    • A user-defined field in the programming of a trunk's TN. First appeared in Release 19 Software.

    • Trunk Route Access Code

    • Every Trunk Route must be assigned a Trunk Route Access Code, although this number is usually not dialed by station users. Among other uses, this code is used in the testing of specific Trunk Routes.

    • Trunk Route

    • A group of one or more trunks that have identical capabilities, to be used for identical purposes. A typical Communication Server would have several Trunk Routes.

    • Trunk

    • A voice and/or data channel between two telecommunications facilities. Trunks connect a private Communication Server to the public telephone network or other private facilities.

    • TTY/VDT

    • One of the devices by which one may enter commands into a Communication Server. Literally meaning a teletype device or, more common, a Video Display Tube.

    U

    • UNR

    • An unrestricted Class of Service

    • Unrestricted Call List (UCL)

    • One of ten individual listings of dialed numbers that may be accessed by otherwise restricted stations, even if the numbers are on the Toll List.

    V

    • Vector Directory Number (VDN)

    • A 'soft-extension' which is not connected to any physical hardware, but rather provides access to a single Vector.

    • Vector

    • A set of treatments performed on incoming calls which can provide customized routing, announcements, and collection of data.

    • Vector Routing Table (VRT)

    • A list of values (entries) that can be referenced when making a conditional decision in a Vector step.

    • Vector Variable

    • A name (A-Z, or AA-ZZ) that replaces static content in the definition of a Vector step, allowing dynamic collection or updating of the content in a consistent manner.

    • Virtual Trunk (VTRK)

    • A software trunk that serves as the bridge between call processing features and the IP network. Unlike a traditional TDM or analog trunk, virtual trunks are routed over an IP network rather than dedicated telecommunications facilities.

    • VMA

    • A Class Of Service (CLS) used for Meridian Mail Voicemail ports. (Server Voice Messaging Allowed)

    • Voice Activity Detection (VAD)

    • When encoding voice communications into IP packets, silence is not encoded and transmitted as part of the voice traffic data. This reduces the overall bandwidth requirements on an IP network, and is an optional feature that may be enabled. VAD is also referred to as Silence Suppression.

    • Voice Menu

    • A series of voice prompts to which a caller may respond by a dialing a series of numbers, # or *.

    • Voice over IP (VoIP)

    • The transmission of voice communications over IP networks. Speech is encoded into IP packets using a codec, and transmitted over an IP network instead of a conventional, dedicated telecommunications network. The IP network may simultaneously be carrying non-voice data as well, resulting in a Converged Network.

    • Voice Recognition Unit (VRU)

    • Hardware and software within the Communication Server which provides voice recognition and response capabilities.

    W

    • Wide Area Network (WAN)

    • A network covering a broad geographical area. A WAN is typically viewed as a network that is external to your organization, and may be public or private.