IVR technology terms used across the industry and specific to VBVoice.



These are the signaling bites used in a telephony environment to signal information.
Used in a T1 call to carry dialing and control information.
This is another name for private branch exchange (PBX). The ACD: answers calls, looks in a database for instructions, will send the call based on instructions to a recording, “Hello, thank you for calling…” or send the call to a hunt group or operator.
The number of the person calling. This is what is displayed on your phone before you answer the call.
A series of functions supplied by a card vendor to allow interaction with their drivers. Most vendors have a series of APIs. In VBVoice™ we use the API to talk to the card.
It incorporates knowledge and research in the linguistics, computer science, and electrical engineering fields.
Telephone transmissions that are not digital (plain old telephone system or service [POTS]).
Converts signals from analog to digital and reverse. See Multiplexer.
When a function call or task is simply called, like playing a waveform audio (WAV) file, and the process returns to the main thread and waits for notification that the process has completed. Term is used mainly in database lookups where the main thread is not locked while the system waits for results.
The interactive voice response (IVR) application that answers and directs all incoming calls.


An integrated services for digital network (ISDN) channel used to convey audio or data rather than signaling. See D channel.
Local phone companies in the US responsible for local calls.
Uses just one B channel for audio and one D channel for data (two channels or lines). Mainly used in Europe and it’s as cheap as analog.
All phone systems run on DC power. They all have battery power backups and use this to smooth the AC power dips and spikes.
A tone to signal line is in use.


A form of out-of-band signaling used in both T1 and E1. It’s a type of ISDN protocol.
Be it Bell, ITT, Qwest, Sprint, etc.
A test unit that acts like a mini CO. Supplies tones, disconnect signals, simulates on-hook off-hook, etc.
A CSU is required in most cases when connecting directly to the public T1 network. The CSU provides functions such as loopback capabilities for running diagnostic tests to locate where problem conditions are occurring on the T1 chain. Some CSU’s have dialing capability for performing remote diagnostics. The CSU is the last point where the signal is regenerated as it leaves the network. It also provides line equalization and voltage protection for telephone company and customer premise equipment, monitors the T1 line for violations and can generate “keep alive” signals and error condition messages. Keep alive,also known as a persistent connection, allows files to be transferred from a web server to a web browser without interruption.
General term for personal computers and phone board configurations used to create IVRs.
In voice processing cadence is the pattern of sound and silence generated in an audio signal. Examples are busy and ring tones. One second of tone followed by three seconds of silence to signify a ring.
A business where calls are answered or made. Can be as small as one person or as big as hundreds of agents.
In telephony this is when two parties are connected. A complete circuit has been made.
This is the technology that listens for tones being returned by the network to indicate what is happening during a call. For example, using call progress analysis is what is used to determine the results of an outbound call.
Analogous to call progress analysis, but call progress monitoring may need to be active during the entire call. Reasons may be that the network isn’t returning a disconnect signal that the board is expecting and it may have to listen for a dial tone to recognize a disconnect.
Busy tone, dial tone, ring tone, etc.
See ANI.
A line, a single path of communication. Not to be confused with ports.
Also called a T1 Multiplexer (MUX). A device at a telephone company CO that converts analog signals from home and business users into digital signals to be carried over higher speed lines between the CO and other exchanges.
A term used in ASR when some consonants are omitted during normal conversation. For example, seven nine and test tube. They’re pronounced seven-ine and test-ube. Hard for discrete recognizers.
A function for converting and compressing audio signals.
The changing of information to use less space (fewer bits) to transmit data. Part of different codecs (e.g., G723, G729, etc).
Where three or more talkers can speak or hear each other.
A term used to describe speech that comes in a relatively short period of time. Can include coarticulation.
A special interface element, like a button or scroll bar made by a third party. VBVoice is an example of a series of custom controls.


Data channel on an ISDN line. Used to transmit calling information like dialed digits. This form of out-of-band processing allows for faster responses.
This is the called number. Used to route calls if a business has more than one posted number.
Specialized chip to do realtime processing of audio or video. DSPs are found on most phone cards.
Term for the tones generated by pushing buttons.
Ability to respond immediately to a received DTMF tone even when playing a prompt.
The string of characters used to represent a dialing process. They will either be numbers for DTMF transmission or URL address for VoIP transmission.
The sound you hear when you pick up the phone. Provided by either the CO or your PBX.
Generic name for the T1/E1 line. Transmission is digital, not analog.
The signal to indicate that one party has hung up.


European digital lines.
Something that happens during a call flow. Events are where code is placed so that it is tripped at the appropriate time during the call flow.


A tone generated and is twice as fast as a busy tone.
Where one copy of a document is sent to several phone numbers.
Ability to create a fax document from database information only.
Used to provide hard copy of information to a caller. For example, doctor calls insurance company, patient’s policy number is entered, doctor’s fax number is entered and hard copy of coverage is faxed back to doctor.
The strand of glass wire used in optical cable.
A brief on-hook period to place a call into a hold. It’s produced by depressing the hook switch. Can be done from a card.


When you make a phone call at the same time someone is trying to call you. Before it rings you pick up the handset and somebody who was calling you is on the line saying, “Hello Hello”. This is glare.
A crude form of voice detection that responds to sound or silence. Doesn’t understand speech.


Dialogic® PowerMedia™ HMP performs media processing tasks on general-purpose servers without requiring the use of specialized hardware.
The process of a call reaching a group of lines.
The way several lines are organized so that calls are routed to a free line. Groups are common in sales, tech support and most departments where several people do the same job.


A set of communication standards for simultaneous digital transmission of voice, video, data and other network services over the traditional circuits of the public switched telephone network.
The portal to internet access. Needs to supply features for VoIP transport.
This is what answers the phone in an automated system.
Signaling that doesn’t need a second channel. Examples are touch tone digits, which are on the same channel. T1 Robbed bit is also in-band.


Current that flows when there is a live connection through an analog phone line.


A standardized communication protocol used by speech servers to provide TTS and ASR services to their clients.
A device that selects one of several analog or digital input signals and forwards the selected input into a single line.
Usually refers to Mitel’s voice bus; has been adopted by other non-Dialogic vendors. Term is used in VBVoice to force MVIP for conferencing (MVIPBridging = yes or no).
A folder or file where messages are stored for a single owner.
A list or selection choice. Used to refer to choices given in an IVR. For example Press 1 for … Press 2 for…
Used to transmit information between multiple cards in the same machine (e.g., SC Bus, H100 Bus).
The encoding used for wav files used by North American phone system phrases.


The file extension of an Active X control. VBVoice uses OCX files for most of its controls.
Custom controls use OLE interfaces to talk to Active X or OCX code.
When you lift the receiver the line has gone OffHook. Alerts the PBX or CO that the user will want to do something.
Phone is on its cradle. Line is not active.
Allows a caller to dial without going off-hook. Not very common.
When invalid numbers are dialed or an error condition occurs an operator intercept may occur. A SIT is played followed by the message explaining the problem.
The signaling is on a separate channel from the one carrying voice or data.


Often referred to as a switch. Does phone switching for a business.
Algorithm used to detect whether a person answered a phone or not.
An analog telephone service implemented over copper twisted pair wires and based on the Bell system.
Is the ISDN equivalent of a T1 circuit. All ISDN lines are PRI.
Worldwide telephone network run by private companies (e.g., Bell, AT&T, Qwest, Sprint, etc).
Service where a caller is charged for the service provided/information (e.g., weather, stock prices, sports scores, etc).
Automated system that makes outbound calls. When the call is answered it transfers the call to an agent.
Old rotary dialing system.
A device that recognizes the clicks of a rotary dial and translates it to tone. Used to be present on older boards.


The four-wire connector used on most phones.
The network connector used to connect T1 lines. Also network cables.
The event that triggers a phone call. A device receives a voltage charge in analog or a bit switch in T1 and it has been programmed to understand that this is an incoming call.


A set of libraries and documentation needed to create applications using an operating system.
In telephony, a SIT is an inband international standard signal consisting of three rising tones indicating a call has failed. It usually precedes a recorded announcement describing the problem.
The process of grabbing a line prior to making a call.
A T1 line.
Another term for automated speech recognition.
A specialized card that can send a voltage to a handset to cause it to ring. It is used in call centers.
A call transfer made by an automated device that attempts to determine the results (i.e., answer, busy, etc).


Digital transmission line.
Microsoft’s API for telephone. Mainly used by Mitel to connect IVR to their switch.
A method of transmitting and receiving independent signals over a common signal path by means of synchronized switches at each end of the transmission line so that each signal appears on the line only a fraction of time in an alternating pattern. It is used when the data rate of the transmission medium exceeds that of signal to be transmitted.
Process of converting text to audio.
One channel on a TDM transmission.
Two insulated copper wires. Two wires is what is needed for a single channel in analog.


Known as a web address; a web resource that specifies its location on a computer network and a mechanism for retrieving it.


A software implementation of a machine (i.e., a computer) that executes programs like a physical machine.
A visual representation of an IVR call menu on a customer’s smartphone or computer screen.
A tool embedded in VBVoice that enables all VBVoice controls to develop a call flow that can process both voice calls and data sessions from a browser supporting HTML 5.
Another name for phone board. A add in board to allow telephone processing in a PC.
Ability of a machine to understand human speech (known as ASR). Nuance and LumenVox are examples.
A system that records messages and stores them for later retrieval.


A signal that is sent in a T1 transmission to signal a call is coming.