ISO/IEC TR 18053:2000

Information technology - Telecommunications and information exchange between systems - Glossary of definitions and terminology for Computer Supported Telecommunications Applications (CSTA) Phase III

This Technical Report contains definitions of technical terms and acronyms used throughout the suite of publications comprising CSTA Phase III.

Technologies de l'information — Télécommunications et échange d'information entre systèmes — Glossaire de definition et terminologie pour applications en télécommunications supportées par ordinateur (CSTA) en phase III

General Information

• Status: Published
• Publication Date: 19-Jul-2000
• ICS: 01.040.35 - Information technology (Vocabularies)
• ICS: 35.100.30 - Network layer
• Technical Committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
• Drafting Committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
• Current Stage: 9093 - International Standard confirmed
• Start Date: 23-May-2025
• Completion Date: 30-Oct-2025

Overview

ISO/IEC TR 18053:2000 is a Technical Report that provides a comprehensive glossary of definitions and terminology used across the Computer Supported Telecommunications Applications (CSTA) Phase III suite. Published by ISO/IEC and prepared from ECMA materials, this report does not specify protocols or services itself but standardizes the technical vocabulary needed to implement and interpret CSTA Phase III documents and implementations.

Key topics

This glossary covers a broad range of telecommunication and CTI (Computer Telephony Integration) concepts, including:

• Call and connection concepts: call, connection, call state, alerting, hold, consultative call, conference, queued call, global call
• Device and appearance terms: device, CSTA device, device identifier, appearance, addressable device/appearance, logical vs physical device
• ACD and agent models: Automatic Call Distributor (ACD), ACD group/device, agent, agent state and logging, agent associations
• Media and signalling: media stream, media type, codec, DTMF, analogue/digital lines, ISDN, PSTN
• Service, event and control elements: event report, acknowledgement models (atomic, multi-step), application association, API, ACSE/ROSE references
• Identifiers and records: call identifier, connection identifier, GlobalCallID, call detail record (CDR)
• Operational and network terms: routing devices, switching domains, queues, trunk, PBX

Note: the report’s table of contents lists many additional terms (over several hundred) to ensure precise, consistent usage in CSTA Phase III documentation.

Practical applications

ISO/IEC TR 18053:2000 is primarily a reference tool that improves clarity and interoperability across CTI and telecommunications projects:

• Ensures consistent terminology in CSTA Phase III implementations, vendor documentation, and API specifications
• Aids software developers and integrators building CSTA-compliant CTI applications or gateways
• Supports system architects and network engineers when mapping telephony services to computing functions
• Helps test labs and QA teams create unambiguous test cases and conformance statements
• Useful for standards writers, trainers, and technical authors preparing documentation or training materials

Who should use it

• Telecommunications engineers and CTI integrators
• Application developers implementing CSTA APIs
• PBX and contact center solution vendors
• Test/QA engineers and interoperability labs
• Standards bodies, technical writers, and trainers

Related standards

• ISO/IEC 18051:2000 (CSTA Phase III - Services for CSTA) - cited as the normative reference and the services specification that the glossary supports.

Using ISO/IEC TR 18053:2000 helps teams reduce ambiguity, speed integration, and improve cross-vendor interoperability in CSTA-based telephony and CTI systems.

Standards Content (Sample)

TECHNICAL ISO/IEC
REPORT TR
First edition
2000-07-15
Information technology —
Telecommunications and information
exchange between systems — Glossary of
definitions and terminology for Computer
Supported Telecommunications
Applications (CSTA) Phase III
Technologies de l'information — Télécommunications et échange
d'information entre systèmes — Glossaire de définition et terminologie pour
applications en télécommunications supportées par ordinateur (CSTA) en
phase III
Reference number
©
ISO/IEC 2000
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© ISO/IEC 2000
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ii © ISO/IEC 2000 – All rights reserved

Contents
Foreword x
Introduction xi
1 Scope 1
2 Normative references 1
3 Definitions and Acronyms 1
3.1 Account Code 1
3.2 ACD 1
3.3 ACD Group 1
3.4 ACD Group Device 1
3.5 Acknowledgement 1
3.6 Acknowledgement Model 1
3.7 ACSE 1
3.8 Active Call 1
3.9 Active Participation 1
3.10 Addressibility 1
3.11 Addressable Appearance 1
3.12 Addressable Device 2
3.13 Agent 2
3.14 Agent Group Association 2
3.15 Agent Identifier 2
3.16 Agent Logging State 2
3.17 Agent Password 2
3.18 Agent State 2
3.19 Agent State Model 2
3.20 Alerting 2
3.21 Alerting Call 2
3.22 Alerting Connection State 2
3.23 Allocation Condition 2
3.24 Analogue 2
3.25 Analogue Line 2
3.26 ANI 2
3.27 API 2
3.28 Appearance 2
3.29 Appearance Type 3
3.30 Application Association 3
3.31 Application Context 3
3.32 Application Domain 3
3.33 Application Entity 3
3.34 Application Entity Type 3
3.35 Application Service Element 3
3.36 Application Working Domain 3
3.37 ASE 3
3.38 ASN 3
3.39 Association Control Service Element 3
3.40 Asynchronous 3
3.41 ATM 3
3.42 Atomic Acknowledgement Model 3
3.43 Auditory Apparatus 3
3.44 Auditory Apparatus Identifier 3
3.45 Auditory Apparatus Type 4
3.46 Authorisation Code 4
3.47 Auto-Answer 4
3.48 Auto Work Mode 4
© ISO/IEC 2000 – All rights reserved iii

3.49 Automatic Call Distributor4
3.50 Automatic Number Identification 4
3.51 B Channel 4
3.52 Bandwidth 4
3.53 Bearer Mode 4
3.54 Bearer Services 4
3.55 Bit Rate 4
3.56 BRI 4
3.57 Bridging 4
3.58 BRI-ISDN 4
3.59 Button 5
3.60 Button Associated Number 5
3.61 Button Association 5
3.62 Button Function 5
3.63 Button Identifier 5
3.64 Button Label 5
3.65 Call 5
3.66 Call Appearance 5
3.67 Call Associated Event 5
3.68 Call Associated Feature 5
3.69 Call Control Event 5
3.70 Call Control Information Element 5
3.71 Call Detail Record 5
3.72 Call Event Report 5
3.73 Call Identifier 5
3.74 Call Linkage 5
3.75 Call Qualification Data 5
3.76 Call Related Information 6
3.77 Call State 6
3.78 Call Thread 6
3.79 Callback 6
3.80 CallBack Call 6
3.81 Called Line Identity 6
3.82 CallID Only Connection ID 6
3.83 Calling Line Identification 6
3.84 Call-Type Monitor 6
3.85 Capabilities Exchange 6
3.86 CCIE 6
3.87 CDR 6
3.88 Central Office (CO) Line 6
3.89 Central Office (CO) Switch 6
3.90 Channel 6
3.91 Character Set 7
3.92 Classifier 7
3.93 CODEC 7
3.94 Complete Connection ID 7
3.95 Compound Call State 7
3.96 Computing Domain 7
3.97 Computing Function 7
3.98 Computing Sub-Domain 7
3.99 Conference Call 7
3.100 Connected State 7
3.101 Connection 7
3.102 Connection Identifier 7
3.103 Connection Mode 7
3.104 Connection Rate 7
3.105 Connection State 7
3.106 Connection State Transition 7
iv © ISO/IEC 2000 – All rights reserved

3.107 Connection State Transition Graph 8
3.108 Consultation Call 8
3.109 Correlator Data 8
3.110 CSTA 8
3.111 CSTA Application 8
3.112 CSTA Client 8
3.113 CSTA Device 8
3.114 CSTA Domain 8
3.115 CSTA Object 8
3.116 CTI 8
3.117 D Channel 8
3.118 Data Call 8
3.119 Data Connection 8
3.120 Data Path 8
3.121 Data Path State 8
3.122 Data Rate 8
3.123 DD 8
3.124 Default Value 8
3.125 Defined Parameter Type 9
3.126 Delay Tolerance 9
3.127 Device 9
3.128 Device Capabilities 9
3.129 Device Category 9
3.130 Device Configuration 9
3.131 Device Element 9
3.132 Device Element Combination 9
3.133 Device Feature 9
3.134 Device Identifier 9
3.135 Device Identifier Format 9
3.136 Device Identifier Status 9
3.137 Device Media Characteristics 9
3.138 Device Only Connection ID 9
3.139 Device State 9
3.140 Device Type 10
3.141 Device-Type Monitor 10
3.142 Dialled Number Identification Service 10
3.143 Digital Line 10
3.144 Directory Number 10
3.145 Display 10
3.146 Display ID 10
3.147 DND 10
3.148 DNIS 10
3.149 Do Not Disturb 10
3.150 Domain 10
3.151 DTMF 10
3.152 Dual Tone Multiple Frequency 10
3.153 Dynamic Device Identifier 10
3.154 Dynamic Feature Availability 10
3.155 Encoding Algorithm 11
3.156 End-to-End 11
3.157 Entering Distribution 11
3.158 Error Value 11
3.159 Event 11
3.160 Event Cause 11
3.161 Event Report 11
3.162 Event Template 11
3.163 Extension 11
3.164 Flow Direction 11
© ISO/IEC 2000 – All rights reserved v

3.165 Forwarding 11
3.166 Forwarding Condition 11
3.167 Gain 11
3.168 Global Call 11
3.169 GlobalCallID 11
3.170 Group Device 12
3.171 Held Call 12
3.172 Hold 12
3.173 Hold Connection State 12
3.174 Holding Device 12
3.175 Hookswitch 12
3.176 Hookswitch Association 12
3.177 Hunt Group 12
3.178 ID 12
3.179 Identifier Parameter Type 12
3.180 Inband 12
3.181 Inbound Call 12
3.182 Incoming Call 12
3.183 Integrated Services Digital Network 12
3.184 Intrude 13
3.185 I/O Cross Reference Identifier 13
3.186 I/O Services 13
3.187 ISDN 13
3.188 ISO 13
3.189 ITU-T 13
3.190 Join 13
3.191 KBPS 13
3.192 Lamp 13
3.193 Lamp Colour 13
3.194 Lamp Identifier 13
3.195 Lamp Label 13
3.196 Lamp Mode 13
3.197 LAN 13
3.198 Last Redirection Device 13
3.199 Line 13
3.200 Logical Device Event 13
3.201 Logical Device Features 14
3.202 Logical Display 14
3.203 Logical Element 14
3.204 MAD 14
3.205 Maintenance Event 14
3.206 Manual Mode 14
3.207 Media 14
3.208 Media Access Device 14
3.209 Media Call Characteristics 14
3.210 Media Class 14
3.211 Media Service 14
3.212 Media Service Instance 14
3.213 Media Service Type 14
3.214 Media Stream 14
3.215 Media Stream Channel 14
3.216 Media Stream Event 14
3.217 Media Stream ID 14
3.218 Media Stream Information 14
3.219 Media Type 14
3.220 Message 15
3.221 Message Identifier 15
3.222 Meta Parameter Type 15
vi © ISO/IEC 2000 – All rights reserved

3.223 Microphone 15
3.224 Monitor Type 15
3.225 Monitoring Services 15
3.226 Multi-Stage Dialling 15
3.227 Multi-Step Acknowledgement Model 15
3.228 Mute 15
3.229 Named Device Type 15
3.230 Network Interface Device 15
3.231 NID 15
3.232 Null Connection State 15
3.233 Null Correlator Data 15
3.234 ODP 15
3.235 Offered Mode 16
3.236 Off-Hook 16
3.237 On-Hook 16
3.238 Operator Device 16
3.239 Operator Group Device 16
3.240 OSI 16
3.241 Other Device 16
3.242 Other Group Device 16
3.243 Outband (Out of Band) 16
3.244 Outbound Call 16
3.245 Outgoing Call 16
3.246 PAC 16
3.247 Parameter Type 16
3.248 Parameter Type Template 16
3.249 Park 16
3.250 Park Device 16
3.251 Party 17
3.252 PBX 17
3.253 PDU 17
3.254 Physical Base 17
3.255 Physical Component 17
3.256 Physical Device Event 17
3.257 Physical Device Features 17
3.258 Physical Display 17
3.259 Physical Element 17
3.260 Pick 17
3.261 Pick Group 17
3.262 PICS 17
3.263 PICS Proforma 17
3.264 PISN 17
3.265 Plain Old Telephone Service 17
3.266 Position Pointer 17
3.267 POTS 18
3.268 Pre-Delivery 18
3.269 Predictive Dial Call 18
3.270 Predictive Dialling 18
3.271 PRI-ISDN 18
3.272 Primary Call 18
3.273 Private Event 18
3.274 Profile 18
3.275 Prompting 18
3.276 Protocol Information Conformance Statement 18
3.277 Protocol Specific Information 18
3.278 PSTN 18
3.279 PTN 18
3.280 Queue 18
© ISO/IEC 2000 – All rights reserved vii

3.281 Queued Call 18
3.282 Recall 18
3.283 Redirection Device 18
3.284 Remote Operations 19
3.285 Reorder Condition 19
3.286 Reporting Criteria 19
3.287 Request 19
3.288 Response 19
3.289 Ring Count 19
3.290 Ring Cycle 19
3.291 Ring Mode 19
3.292 Ring Pattern 19
3.293 Ringback Tone 19
3.294 Ringer 19
3.295 Ringer Identifier 19
3.296 Ringing Mode 19
3.297 ROSE 19
3.298 Routeing Cross Reference Identifier 19
3.299 Routeing Device 19
3.300 Routeing Dialogue 19
3.301 Routeing Registration Identifier 20
3.302 Routeing Server 20
3.303 RSVP 20
3.304 Secondary Call 20
3.305 Service 20
3.306 Service Boundary 20
3.307 Service Request 20
3.308 Service Response 20
3.309 Service Template 20
3.310 Signalling Capability 20
3.311 Silent Intrusion 20
3.312 Silent Monitoring 20
3.313 Silent Participation 20
3.314 Simple Call State 20
3.315 Snapshot Services 20
3.316 Speaker 20
3.317 Special Resource 21
3.318 Special Resource Domain 21
3.319 Special Resource Function 21
3.320 Special Resource Sub-Domain 21
3.321 Speech 21
3.322 SRF 21
3.323 State 21
3.324 Static Device Identifier 21
3.325 Station 21
3.326 Status Filter 21
3.327 Status Reporting Services 21
3.328 Switching Domain 21
3.329 Switching Function 21
3.330 Switching Function Capabilities 21
3.331 Switching Function Service 21
3.332 Switching Sub-Domain 21
3.333 Switching Sub-Domain Name 21
3.334 System Status Registration Identifier 22
3.335 System Status Services 22
3.336 TE 22
3.337 Telephony Process 22
3.338 Telephony Service 22
viii © ISO/IEC 2000 – All rights reserved

3.339 Telephony Tone 22
3.340 Template 22
3.341 TON 22
3.342 Trunk 22
3.343 User 22
3.344 User Data 22
3.345 User-User Information Element 22
3.346 UUIE 22
3.347 Voice 22
3.348 Voice Attribute 22
3.349 Voice Call 22
3.350 Voice Response Unit 23
3.351 Voice Stream Data 23
3.352 Voice Unit 23
3.353 Voice Unit State 23
3.354 VRU 23
4 Terms defined elsewhere 23
© ISO/IEC 2000 – All rights reserved ix

Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the
specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the
development of International Standards through technical committees established by the respective organization to deal with
particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other
international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft
International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the national bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this Technical Report may be the subject of patent rights. ISO
and IEC shall not be held responsible for identifying any or all such patent rights.
Technical Report ISO/IEC 18053 was prepared by ECMA (as Technical Report ECMA TR/72) and was adopted, under a
special “fast-track procedure”, by Joint Technical Committee ISO/IEC JTC 1, Information technology, in parallel with its
approval by national bodies of ISO and IEC.
x © ISO/IEC 2000 – All rights reserved

Introduction
This Technical Report provides definitions and terminology for Standard ECMA-269 (International Standard ISO/IEC 18051),
Services for Computer Supported Telecommunications Applications (CSTA) Phase III, Fourth Edition, published by ECMA in
2000. It is part of a suite of Standards and Technical Reports for Phase III of CSTA. These Standards and Technical Reports
reflect agreements of ECMA member companies on Phase III of CSTA. All of the Standards and Technical Reports in the suite
are based on the practical experience of ECMA member companies and each one represents a pragmatic and widely-based
consensus.
This Technical Report was created from glossary material originally appearing in CSTA Phase II (ECMA-217), from the versit
CTI Encyclopedia (Version 1.0), which was contributed to ECMA by versit. Additional definitions and acronyms were
contributed by ECMA member companies.
© ISO/IEC 2000 – All rights reserved xi

TECHNICAL REPORT ISO/IEC TR 18053:2000(E)
Information technology - Telecommunications and information exchange between
systems - Glossary of definitions and terminology for Computer Supported
Telecommunications Applications (CSTA) Phase III
1Scope
This Technical Report contains definitions of technical terms and acronyms used throughout the suite of publications
comprising CSTA Phase III.
2 Normative reference
The following normative document contains provisions which, through reference in this text, constitute provisions of this
Technical Report. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply.
However, parties to agreements based on this Technical Report are encouraged to investigate the possibility of applying the
most recent edition of the normative document indicated below. For undated references, the latest edition of the normative
document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards.
ISO/IEC 18051:2000, Information technology - Telecommunications and information exchange between systems -
Services for Computer Supported Telecommunications Applications (CSTA) Phase III.
3 Definitions and Acronyms
3.1 Account Code
A computing sub-domain specific code applied to a call for accounting purposes. Also called account information or account
info.
3.2 ACD
Automatic Call Distributor, Automatic Call Distribution. See Automatic Call Distributor.
3.3 ACD Group
See ACD Group Device.
3.4 ACD Group Device
A group device that has a ACD and which represents an explicit association between the ACD and the distributed-to devices.
3.5 Acknowledgement
An acknowledgement is a message that is sent from the switching function to the computing function and visa-versa, and that
informs the requesting computing or switching function whether an earlier request was accepted or rejected.
3.6 Acknowledgement Model
The model by which a service provides a response (acknowledgement) to a requesting function (or client). Each individual
service specifies the acknowledgement model it supports. See Atomic Acknowledgement Model and Multi-Step
Acknowledgement Model.
3.7 ACSE
Association Control Service Element. See Association Control Service Element.
3.8 Active Call
With respect to a particular device, an active call is a call whose connection with the device is in the Connected connection
state.
3.9 Active Participation
This feature is typically used to allow intrusion with the ability to speak and listen by a supervisor into an ACD Call.
3.10 Addressibility
The property of an appearance of having an identifier associated with it.
3.11 Addressable Appearance
An appearance that can be referenced by the switching function via a device identifier.
© ISO/IEC 2000 – All rights reserved 1

3.12 Addressable Device
A device with an associated device identifier. See Device, CSTA Device, Device Identifier.
3.13 Agent
A CSTA user associated with one or more ACD devices or ACD groups and authorised to act on behalf of the provider of the
CSTA application.
3.14 Agent Group Association
An association of an ACD group with an agent.
3.15 Agent Identifier
An identifier by which an agent can be observed and/or controlled within the switching function.
3.16 Agent Logging State
The state of the agent with respect to a particular ACD System. Its possible values are NULL and LOGGED ON.
3.17 Agent Password
A data element used to authenticate an agent associated with a device with an ACD device or ACD group.
3.18 Agent State
A state that an agent may take in relation to an ACD device or ACD group and the calls associated with the ACD device or
ACD group.
3.19 Agent State Model
The model by which the switching function maintains agent states for the ACDs and ACD groups associated with an agent.
3.20 Alerting
A call with a connection in the Alerting connection state is said to be alerting the subject device of that connection.
3.21 Alerting Call
A call for which the subject connection is in the Alerting state. This usually implies that the telephone instrument is ringing.
3.22 Alerting Connection State
A connection state in which a device is alerting (e.g., ringing) or is being presented (offered) to a device. This indicates an
attempt to connect a call to a device. The device may be a device such as a telephone station. The device may also be a routeing
or distribution type of device.
3.23 Allocation Condition
For the Make Predictive Call service, an indication of whether a calling device (e.g., the agent to which the call is to be
connected) has been allocated for the call.
3.24 Analogue
Analogue transmission (such as POTS signals) consists of sound travelling over lines as variations in a electrical current.
Analogue signals are very vulnerable to interference and noise on the line. They are also limited to the bandwidth of amplifiers,
analogue-to-digital converters, and other network equipment.
3.25 Analogue Line
A POTS telephone line that utilises analogue transmission. Signals on an analogue line use a set of standard in-band tones for
call progress and DTMF signalling.
3.26 ANI
Automatic Number Identification. See Automatic Number Identification.
3.27 API
Application Programming Interface.
3.28 Appearance
A component of a device's logical element at which a connection to a call is permitted. A single logical element may have
multiple appearances. Also called call appearance.
2 © ISO/IEC 2000 – All rights reserved

3.29 Appearance Type
An attribute whose value is a categorisation of appearances in terms of their interaction with other appearances. Possible values
include selected-standard, basic-standard, basic-bridged, exclusive-bridged, shared-bridged, Independent-shared-bridged,
Interdependent-shared-bridged.
3.30 Application Association
A cooperative relationship between two application entity invocations that provides the necessary frame of reference between
them in order that they may interwork effectively.
3.31 Application Context
An explicitly identified set of application service elements, related options and any other necessary information for the
interworking of application entities on an application association.
3.32 Application Domain
The union of one switching sub-domain and one computing sub-domain.
3.33 Application Entity
An active element, within an application process, embodying a set of capabilities which is pertinent to OSI and which is defined
for the Application Layer, that corresponds to a specific application entity type (without any extra capabilities being used).
3.34 Application Entity Type
A description of a class of application service elements in terms of a set of capabilities defined for the Application Layer.
3.35 Application Service Element
A set of application functions that provides a capability for the interworking of application entity invocations for a specific
purpose.
3.36 Application Working Domain
The subset of devices (and the calls and connections associated with those devices) inside a switching sub-domain that are
controllable and/or monitorable over a Service Boundary.
3.37 ASE
Application Service Element. See Application Service Element.
3.38 ASN
Abstract Syntax Notation.
3.39 Association Control Service Element
An element of an application process whose primary purpose is to establish and release an application association between two
application entity instances and to determine the application context of that association.
3.40 Asynchronous
A method of invoking a function such that the process which is doing the invoking continues in parallel with the invoked
function. See Synchronous.
3.41 ATM
Asynchronous Transfer Mode.
3.42 Atomic Acknowledgement Model
An acknowledgement model supported by a service in which the positive acknowledgement of a request is accomplished in a
single step. Receipt of an acknowledgement from such a service guarantees that all parameters supplied in the request are
correct and that the service was successfully completed. See Acknowledgement Model and Multi-Step Acknowledgement
Model.
3.43 Auditory Apparatus
A component used to convert electronic signals into voice/speech and/or vice/versa.
3.44 Auditory Apparatus Identifier
An identifier by which an auditory apparatus in a physical element (in a device) can be observed and/or controlled.
© ISO/IEC 2000 – All rights reserved 3

3.45 Auditory Apparatus Type
An attribute subcategorising the auditory apparatus physical component. Possible values include handset, headset,
speakerphone, speaker-only phone, microphone-only, and other.
3.46 Authorisation Code
A code provided to the switching function that is used to check if a computing function user is authorised to perform a given
service.
3.47 Auto-Answer
A feature of a device allowing it to automatically answer a call.
3.48 Auto Work Mode
A feature of an ACD implementation that causes an agent state to automatically transition to the WorkingAfterCall agent state
after an ACD agent completes a call
3.49 Automatic Call Distributor
A device that distributes calls presented to it to other devices. An Automatic Call Distributor may be associated with the
devices to which calls are distributed, but itself consists only of the distribution mechanism.
3.50 Automatic Number Identification
A service provided by the telephone network that provides the billing directory number associated with a calling device. The
number provided by ANI will not always be the same as the number of the calling device. Outside of North America, this
service is called Calling Line Identification (CLID).
3.51 B Channel
A 56 or 64 Kbps channel on an ISDN or proprietary PBX line that can carry voice or data.
3.52 Bandwidth
The information carrying potential of a physical or logical connection. For analogue connections it is the range of frequencies
that a circuit can handle. With POTS, for example, the bandwidth is very narrow. The broader the range of frequencies, the
more information the line can handle. The typical POTS circuit has a bandwidth of 3100 Hz centred between 300 Hz and
3400 Hz. For digital connections, the bandwidth is the data rate of the circuit or channel.
3.53 Bearer Mode
The type of coding, or compression that the telephone network is permitted to perform on the bit stream carried on the bearer
channel. In POTS, the bearer mode will always be 3.1 kHz voice. The “speech” bearer mode is the most compressible, “voice”
less so, and so on. A data bearer mode implies that the data stream will not be compressed by the network (the connection is
“clear channel”).
3.54 Bearer Services
Telephone Network Services designed to transfer information from point A to point B.
3.55 Bit Rate
A media call characteristic, indicating whether the media stream of the call has a constant data rate (i.e., is isochronous) or a
variable bit rate.
3.56 BRI
Basic Rate Interface.
3.57 Bridging
A directory number is assigned to more than one device such that when an incoming call is targeted for the directory number,
all devices are prompted for the call. The devices in question are said to have bridged device configurations of various kinds.
See Device Configuration.
3.58 BRI-ISDN
An ITU-T-defined “Basic-Rate Interface” ISDN connection consisting of two B channels of 64 Kbps each for voice or data,
and one D channel of 16 Kbps for control (2B+D). See PRI-ISDN.
4 © ISO/IEC 2000 – All rights reserved

3.59 Button
A button is a physical (i.e., represented by hardware) or logical (i.e., represented by switching function software) component of
a device that controls a certain function or action assigned to the button.
3.60 Button Associated Number
A device identifier in diallable digits format associated with the feature or service assigned to a button.
3.61 Button Association
An attribute of a lamp that identifies a button to which the lamp is associated.
3.62 Button Function
The feature or service that is performed in response to activating (e.g., pressing) a button. The button function may be assigned
to the button by the switching function.
3.63 Button Identifier
An identifier associated with a button used to observe and control it through the Service Boundary. It is used in combination
with the Device Identifier of the device of which it is a component.
3.64 Button Label
A character string representing the label by which a user refers to a button.
3.65 Call
A switching function communications relationship (generally) between two or more devices. During some circumstances,
including set-up and release, there may be only one device.
3.66 Call Appearance
See Appearance.
3.67 Call Associated Event
Events related to the Call Associated Features Services.
3.68 Call Associated Feature
A collection of features (including DTMF digit generation and collection, telephony tone generation and collection, and user
information transmission) controlled by the Call Associated Feature Services.
3.69 Call Control Event
An event that reports changes to information related to calls.
3.70 Call Control Information Element
An information type that denotes the type of call control information available in a sub- domain. Possible values include ISDN,
ATM (B-ISDN), ISO-Ethernet, RSVP, Other (switching sub-domain specific).
3.71 Call Detail Record
An information element describing information about a call relevant to charging for the call or tracking its progress through a
call centre. Call Detail Records are transmitted from a switching function to a computing function via an event report.
3.72 Call Event Report
Messages that indicate a change in state of one or more connections in the switching sub-domain.
3.73 Call Identifier
A Call Identifier is a reference associated with a call whereby the call can be known to, and identified by, the switching,
computing and special resource functions through the call’s life.
3.74 Call Linkage
A set of information elements associated with a call that identify the global call to which the call belongs, and the call thread to
which the call belongs.
3.75 Call Qualification Data
A collection of data (e.g., wrap code, walk away codes, hold reasons, consult reasons, transfer reasons) that describes how a
call is being handled or was handled by a user.
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3.76 Call Related Information
Additional information associated with a call, including account information and authorisation codes.
3.77 Call State
A list of the connection states of all of the devices involved in a call (also called the Compound Call State). See also Simple
Call State.
3.78 Call Thread
A set of calls that are related to each other because they are part of same telephony process.
3.79 Callback
This telephony feature allows a device to request that the originally called (e.g., busy) device return the call when the originally
called device becomes available.
3.80 CallBack Call
A call that is automatically established by the switching function in response to a prior service request or feature when the
target device is in an appropriate state to accept the call.
3.81 Called Line Identity
A service supplied by the public telephone network to identify a logical called device. For example, two 1-800 numbers might
both be translated to a single real number. the Called Line Identity information distinguishes which of the two numbers was
originally dialled.
In North America this service is called Dialled Number Identification Service (DNIS).
3.82 CallID Only Connection ID
A connectionID format in which only a call identifier appears. ConnectionID parameters of this type can be used only with
certain services.
3.83 Calling Line Identification
A service provided by the telephone network that provides the billing directory number associated with a calling device. The
number provided by CLID will not always be the same as the number of the calling device.
In North America this service is called Automatic Number Identification.
3.84 Call-Type Monitor
A monitor that tracks behaviour of a call, providing notifications of events for the call and for all devices associated with the
call.
3.85 Capabilities Exchange
A set of services by which a computing function discovers the devices, elements, and associated attributes, features, or services
of a switching sub-domain.
3.86 CCIE
Call Control Information Element. See Call Control Information Element.
3.87 CDR
Call Detail Record. See Call Detail Record.
3.88 Central Office (CO) Line
A network interface device in a central office (CO) switch to a subscriber station (e.g., a telephone).
3.89 Central Office (CO) Switch
A telephone switching system that resides in the telephone service provider’s network. There are different types of central
office switches, depending upon the role of the switch within the telephone network. Commonly, a central office switch
connects customer lines to other customer lines, customer lines to trunks, or customer PBXs to trunks, and is the point at which
local subscriber lines terminate for switching to other lines or trunks.
3.90 Channel
A logical communications path between devices in a network. A channel is associated with a connection, and transmits or
receives media streams between devices related by the connection.
6 © ISO/IEC 2000 – All rights reserved

3.91 Character Set
For a display, an attribute denoting the character set used to represent characters in the display.
3.92 Classifier
A switching function resource that classifies predictive calls as answered, ringing, sent to Special Indicator Tone, or other
vendor specific classifications.
3.93 CODEC
COder/DECoder.
3.94 Complete Connection ID
A connection ID format which contains both the call ID and the device ID of the call and device associated by the connection.
3.95 Compound Call State
See Call State.
3.96 Computing Domain
The set of computers and their objects that may be reached directly or indirectly by a CSTA application from a switching
domain.
3.97 Computing Function
The part of the domain needed to support CSTA applications that is also within a Computing or Special Resource sub-domain.
3.98 Computing Sub-Domain
Any configuration of inter-connected computers that presents the appearance and functionality of a single computer to the
switching and special resource domains.
3.99 Conference Call
A telephone call consisting of three or more connected devices.
3.100 Connected State
A connection state in which a device is actively participating in a call. This state includes logical participation in a call as well
as physical participation (i.e., a Connected device cannot be on Hold).
3.101 Connection
A relationship between a call participant (device) and a call. A device’s connection represents that device’s participation in a
telephone call. A connection can also be thought of as a “leg” of a particular call that connects a device with a specific call
within the switching sub-domain.
3.102 Connection Identifier
An identifier used to identify a relationship between a specific call and a specific device. The Connection Identifier comprises a
Call Identifier and a Device Identifier. Together, these identifiers specify a unique CSTAObject in the context of a CSTA
Association.
3.103 Connection Mode
The means by which a media stream channel of a connection is attached to the media stream channel of a media service
instance.
3.104 Connection Rate
A media call characteristic, indicating whether the media stream of a call is digital, and if so, indicating its bit rate.
3.105 Connection State
One attribute of a connection with respect to the existence and operation of a call to which the connection connects a device.
The possible values of a connection state are represented in a connection state transition graph, which defines the permissible
transitions between connection states. See also State.
3.106 Connection State Transition
The process by which the value of a connection state changes, either in response to an external occurrence or because of a
request sent to the switching function. The connection states to which a given connection state may transition are specified by
the CSTA standard, and represented by a connection state transition graph.
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3.107 Connection State Transition Graph
A representation of the permissible transitions from one connection state to another, as defined by the CSTA Standard.
3.108 Consultation Call
The compound action of placing an active call on hold at a device and issuing a second call from the same device.
3.109 Correlator Data
Computing domain-specific data associated with a call and used to track a call as it is controlled and monitored by the
computing function. See also Null Correlator Data.
3.110 CSTA
Computer Supported Telecommunications Applications.
3.111 CSTA Application
A cooperative process between a Switching Function performed within a switching network and a Computing Function
performed within a computing network.
3.112 CSTA Client
In CSTA, a client is a local communication component of the Switching, Computing, or Special Resource Functions that
requests a particular service of another function through a service boundary.
3.113 CSTA Device
A device that is visible and/or controllable via CSTA. See also Device.
3.114 CSTA Domain
The set of accessible Computing, Switching and Special Resource Functions from which an application might receive service.
3.115 CSTA Object
A conceptual entity in the CSTA model. Calls, connections, devices, elements, appearances are all CSTA objects.
3.116 CTI
Computer Telecommunications Integration. This is an updated definition of the acronym "Computer Telephony Integration",
reflecting changes in technology current with this version of the Standard.
3.117 D Channel
A channel on an ISDN line that can carry signalling information and low-speed packet data.
3.118 Data Call
A call on which the media type of the media stream transmitted between devices is other than voice (e.g., fax, data).
3.119 Data Connection
A connection whose capabilities support data channels, i.e., channels that carry media stream types other than voice.
3.120 Data Path
A logical object in the switching function that allows the exchange of data between a telephony device and a switching function
component for a given application association.
3.121 Data Path State
A state in which an I/O-services dialogue between a telephony device and a switching function may find itself.
3.122 Data Rate
The capacity of a channel to carry data, measured in bits per second. The rate at which data is transmitted on a channel,
measured in bits per second.
3.123 DD
Diallable Digits.
3.124 Default Value
A value that is automatically supplied or assumed by the server when no value is supplied by the client.
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3.125 Defined Parameter Type
A parameter type describing information elements specific to CSTA, e.g., auditory device lists, correlator lists. The parameter
type describes the meaning, format, and interpretation rules of the information elements.
3.126 Delay Tolerance
A media call characteristic, indicating the maximum tolerable variability of the bit rate of a media call.
3.127 Device
A physical (e.g., buttons, lines, trunks, stations) or logical (e.g., groups of physical devices, pilot numbers, ACD groups) entity
that is used to access telecommunications services. See also CSTA Device.
3.128 Device Capabilities
Information elements describing the services, features, and attributes of a device.
3.129 Device Category
A device attribute that provides a generic indication of the device’s behaviour and configuration. Possible values include
Station Device Category, Network Interface Device Category, ACD Device Category, ACD Group Device Category, Hunt
Group Device Category, Park Device Category, Pick Group Device Category.
3.130 Device Configuration
A device attribute describing the arrangement of the various elements and appearances associated with the device. Multiple
device configurations may be formed from different combinations of physical elements, logical elements, and appearance types.
3.131 Device Element
The attributes, features and services that determine the device’s physical interface and the control and observation of calls.
Device elements are subcategorised into physical elements and logical elements.
3.132 Device Element Combination
A categorisation of device in terms of the combination of physical and logical elements comprising it. Possible values include
Logical Element Only, Physical Element Only, Logical and Physical Element.
3.133 Device Feature
A service provided by a device that can be invoked by a computing function or by a manual activity. Raising or lowering the
speaker volume is an example of a device feature, as is activating call forwarding on the device.
3.134 Device Identifier
An identifier by which a CSTA device is referenced across a Service Boundary. A Device Identifier may be static or dynamic.
A Device Identifier may refer to multiple devices distinguished by their MediaCallCharacteristics.
3.135 Device Identifier Format
A format by which a device identifier may be expressed in an information element. Possible values include diallable digit
format, switching function representation format, device number format.
3.136 Device Identifier Status
An attribute of a parameter representing a device identifier, indicating if the device identifier is present in the parameter, or the
reason why the device identifier is not provided in the parameter.
3.137 Device Media Characteristics
A collection of device attributes that specify its media features, including media class, media stream information, and protocol
information. These are used in Call Control Services to select devices for a call, and in Call Control Events to report media
characteristics associated with devices.
3.138 Device Only Connection ID
A connection ID format in which only a device ID appears.
3.139 Device State
The collection of states of the elements, components, and calls associated with a device. These include the connection state,the
physical device features, and the logical device features.
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3.140 Device Type
A device attribute denoting a generic indication of the device’s behaviour and configuration. Possible values of this attribute
include station device, network interface device, ACD device, Button, Button Group, Conference Bridge, Line, Line Group,
Operator, Operator Group, Parking Device, Station, Station Group, Trunk, Trunk Group, Other, Other Group.
3.141 Device-Type Monitor
A monitor that tracks behaviour of a device, providing notifications of events for the device and for all calls associated with the
device.
3.142 Dialled Number Identification Service
A service supplied by the public telephone network to identify a logical called device. For example, two 1-800 numbers might
both be translated to a single real number. The DNIS information distinguishes which of the two 1- 800 numbers was originally
dialled.
3.143 Digital Line
A digital station line on a PBX or digital-key system. Signalling on a digital line usually uses a vendor-specific (proprietary)
protocol or ISDN protocol to exchange messages between the switch and the telephone. A digital line typically requires a
“matched” telephone set.
3.144 Directory Number
A logical concept that translates to a device. It is typically associated with a line (extension) circuit.
3.145 Display
A physical or virtual component which presents a two dimensional array of characters associated with the physical element.
3.146 Display ID
An identifier associated with a display used to observe and control it through the Service Boundary. It is used in combination
with the Device Identifier of the device of which it is a component.
3.147 DND
Do Not Disturb. See Do Not Disturb.
3.148 DNIS
Dialled Number Identification Service. See Dialled Number Identification Service.
3.149 Do Not Disturb
A switch feature that temporarily blocks incoming calls to a telephone. The incoming calls are routed to another (typically
switch-defined) destination or, if no alternate destination is defined, may be related as if the called line were busy or ringing.
The target telephone is not alerted.
3.150 Domain
The union of the switching domain, computing domain, and special resource domain.
3.151 DTMF
Dual Tone Multiple Frequency. See Dual Tone Multiple Frequency.
3.152 Dual Tone Multiple Frequency
Pressing a button on the keypad of a Touch tone telephone generates a pair of tones of specified frequency. The network or the
equipment at the end of the connection (such as remote control for a telephone answering machine) detects and interprets these
tones.
3.153 Dynamic Device Identifier
A device ID created by the switching function for a device when it enters into a call. A dynamic device identifier remains
constant for the life of the device’s participation in the call.
3.154 Dynamic Feature Availability
A capability that can be supported by a switching function whereby the switching function returns an enumeration of the
services available at a connection at a given instant. The enumeration is returned in appropriate events as the value of a special
ServicesPermitted parameter.
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3.155 Encoding Algorithm
An algorithm used to translate an audio or video signal into a bit-stream or byte-stream representation. Examples of encoding
algorithms are ADPCM, mu-law or a-law.
3.156 End-to-End
For the Generate Digits service, digits that are sent from a source device to a destination device, rather than digits that are used
to specify a device address.
3.157 Entering Distribution
In this mode of the Alerting connection state, a call is being presented to a distribution device in order to be distributed. This
mode is indicated by a Delivered event with a cause code of Entering Distribution.
3.158 Error Value
An enumerated value describing an error and returned with a ne
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