This Glossary of Terms sets forth the definitions for certain terms contained in the Service Description for Kaleyra.io, Communicate Pro, Video Products, and APIs.

TermDefinition
Click-to-call (C2C)Click-to-call (which is sometimes called click-to-talk, click-to-dial or click-to-text) refers to a type of digital communication in which a person clicks a button or text in order to be connected with another individual in real-time.
Communications Platform as a Service (CPaaS)A cloud-based platform that enables developers to add real-time communication capabilities to their own applications without building backend infrastructure or interfaces.
ChatbotA chatbot can be defined as an AI-based computer program that simulates human conversations. They are also known as digital assistants that understand human capabilities. Bots interpret and process the user requests and give prompt relevant answers. Bots can interact through voice as well as text and can be deployed across websites, applications, and various popular messaging channels.
Contact center inbound (CTI)The routing mechanism of a CTI like Genesys dispatches incoming calls to an available operator. When the operator answers, an actual session is created within Kaleyra Video, allowing one-to-one communication with the client.
Call to actionInstructions on how users can opt-in to a mobile communications program (for
instance, to receive special coupon offers on a regular basis).
CTIACTIA is a trade association representing wireless carriers and suppliers, and manufacturers and providers of wireless products and services. You can find a copy of CTIA's latest Short Code Compliance Handbook here: https://www.wmcglobal.com/hubfs/CTIA%20Short%20Code%20Monitoring%20Handbook%20-%20v1.8.pdf.
Direct Inward Dialing Number (DID)Direct Inward Dialing (DID) numbers can process multiple simultaneous incoming calls and route them to existing phone numbers or extensions. Also, allow businesses to scale efficiently while only managing one number.
Do Not Disturb (DND) numbersA service initiated by the Telecom Regulatory Authority of India (TRAI) for customers or generally the public who do not wish to receive unwanted calls or SMS for promotional purposes.
Delivery Report (DLR)A delivery report or DLR is the notification you recieve when the SMS from your number has been delivered successfully.
Email APIThe Email API service is a channel through which customers can send emails to a specific recipient or to multiple recipients at once, along with attachments. For more information, see Email API page.
Flow BuilderFlow Builder makes communication easy for everyone. With a flow builder, one can create communications workflow for Voice, SMS, and Webhooks without a single line of code. It can be used for automating, prototyping, and connecting communications flows with your customers within minutes. For more information, see Flow Builder page.
Interactive Voice Response (IVR)A telephony technology that allows an automated system to interact with callers and helps route calls to relevant recipients, via voice commands or touch-tone key selection.
KeywordA short word that is sent to a short code to request information or indicate some sort of action
Know Your Customer (KYC)Verification process mandated by the RBI. Every business that deals with financial transactions must follow the KYC process to identify and authorize its future customer.
LookupLookup is a feature that can be used to validate users’ phone numbers and get information about the phone number.
MMSAcronym for Multimedia Messaging Service, which allows for multimedia content (such as pictures, video, and ring tones) to be exchanged via mobile phones.
Mobile-originated (MO) messagesA message that is sent from a user’s mobile phone to Communicate Pro.
Mobile-terminated (MT) messagesA message that is sent by Communicate Pro to a user’s mobile phone.
Opt-in/Opt-outTo comply with CTIA and carrier best practices, you may only send messages to users who have explicitly indicated that they wish to receive them. This process is known as “opting in”. Users may also indicate they no longer wish to receive messages by “opting out”. Opting in and opting out can be done from a user’s mobile phone by sending SMS messages or may also be done through other methods (such as a website form, and many more).
OmnichannelOmnichannel selling offers a unified brand experience to customers irrespective of the channel they are on. For instance, under omnichannel retail, a brand would facilitate the same experience on its offline and online outlets.
One Time Password (OTP)An OTP is used to validate the authenticity of the user. As the name suggests, it is a one-time-password and expires after each session. The OTP can be purely numeric or alphanumeric. It is often used as one of the modes to verify the user’s identity during 2FA (Two-Factor Authentication) or MFA (Multi-Factor Authentication).
Short codeA special telephone number, usually five or six digits, used to send and receive messages from mobile phones.
SMSAcronym for Short Message Service, which allows for short messages to be exchanged on mobile devices. SMS messages are generally limited to 160 characters each (including spaces). Longer messages are usually re-constructed on the user’s mobile phone.
SMS APIThe SMS API is a well-defined software interface that allows your code to send short messages through an SMS gateway. SMS APIs are commonly used to bridge the gap between carrier networks and the wider Internet. The SMS API allows web applications to easily send and receive text messages via logic written for standard web frameworks. For more information, see SMS API page.
Sender IDBusinesses often subscribe to a unique number or name while sending text communication. This Sender ID is displayed in the “from” section of the customers’ inbox. It helps businesses create brand awareness and recall.
Text-to-Speech (TTS)Text-to-Speech (TTS) is a feature that converts text into a voice output, to be read aloud. It is widely used in voice calls for reading out automated messages.
TriggerTrigger is an event that takes place on a given platform and it initiates a specified action.
Toll-free telephone numberA toll-free telephone number or freephone number is a telephone number that is billed for all arriving calls instead of incurring charges to the originating telephone subscriber. For the calling party, a call to a toll-free number from a landline is free of charge.
Verified SMS (vSMS) - Google ServiceA powerful communication channel for businesses. You can share business-critical information such as OTP messages, appointment reminders, credit/debit messages, etc.

For more information, see Google's vSMS document.
Video APIA Video API makes it easy to build a custom video experience within any mobile, web, or desktop application, and is built on the WebRTC industry standard that is available on billions of devices. For more information, see Video API page.
Voice APIA voice API, or application programming interface, is a software connection that enables companies to embed the ability to make and receive voice calls into their applications and networks. For more information, see Voice API page.
WebRTCWeb Real-Time Communication technology allows organizers to establish a secure audio and video channel automatically from any browser or device, without installing any third-party applications.
WhatsApp For BusinessWhatsApp Business, an offering by WhatsApp, is an instant messaging app specially tailored for businesses. It allows businesses to communicate with their customer through rich media messages. For more information, see WhatsApp page.
WhatsApp APIA WhatsApp API sends the messages via WhatsApp from the Kaleyra.io platform. Using WhatsApp API, you can set up your WhatsApp Business API client, register your phone number, and send a WhatsApp message. For more information, see WhatsApp page.