Glossary of Terms for the Products and APIs

This Glossary of Terms sets forth the definitions for certain terms contained in the Service Description for Products and APIs.



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 their future customer.

Distributed Ledger Technology (DLT) - Applicable only in India

A Blockchain-based registration system. This Ledger keeps track of all the records of transactions made by network participants. Where telemarketers have to be registered with operators and users and resellers with operators but through Telemarketer.

For more information, refer to the DLT document.

User Data Header (UDH)

A binary structure that may be present at the start of a short message in the Short Message Service in GSM. It does not contain any text, but it specifies how the message should be formatted and processed.

Communications Platform as a Service (CPaaS)

A cloud-based platform that enables developers to add real-time communications features to their own applications without needing to build backend infrastructure and interfaces.

Short Message Service Center (SMSC)

A network element in the mobile telephone network to store, forward, convert and deliver Short Message Service (SMS) messages.
The full designation of an SMSC according to 3GPP is Short Message Service - Service Center (SMS-SC).

Verified SMS (vSMS) - Google Service

A powerful communication channel for businesses. You can share business-critical information such as OTP messages, appointment reminders, credit/debit messages, etc.

For more information, refer to Google's vSMS document.

Do Not Disturb (DND) numbers

A 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.

Closed User Group (CUG)

A service provided by the mobile operators to mobile subscriber's who can make and receive calls from any member associated within the group. This service is applicable for SMS also.

Mobile Application Part (MAP)

Mobile Application Part (MAP) are messages sent between mobile switches and databases to support user authentication, equipment identification. The Mobile Application Part (MAP), is one of protocols in the SS7 suite, allows for the implementation of mobile network (GSM) signaling infrastructure. The premise behind MAP is to connect the distributed switching elements, called mobile switching centers (MSCs) with a master database called the Home Location Register (HLR).

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.


Unicode is an industry-standard allowing computers to consistently represent and manipulate text expressed in any of the world's writing systems. As an SMS MT feature, it allows any content to be sent within a message.

Long-Term Evolution (LTE)

Long-Term Evolution (LTE) is a standard for high-speed wireless communication for mobile devices and data terminals, based on the GSM/EDGE and UMTS/HSPA technologies. It increases the capacity and speed using a different radio interface together with core network improvements.

Mobile Network Code (MNC)

The Mobile Network Code is either a two or three-digit number used to identify a mobile network in a specified country. The MNC is used as part of the IMSI (International Mobile Subscriber Identity) and LAI (Location Area Identity).

Mobile Country Codes (MCC)

The Mobile Country Codes (MCC) are used in wireless telephone networks (GSM, CDMA, UMTS, etc.) to identify the country which a mobile subscriber belongs to.

Short Message Peer-to-peer Protocol (SMPP)

SMPP is the short message peer-to-peer protocol. It is a telecom industry protocol for exchanging SMS messages between SMS peer entities such as short message service centers (SMSCs).

Mobile Station International Subscriber Directory Number (MSISDN)

Mobile Station International Subscriber Directory Number (MSISDN) is a number which identifies a mobile phone number internationally. It identifies a subscription in a GSM or UMTS mobile network. This number includes country code and a National Destination Code which identifies the subscriber's network operator. The maximum length of an MSISDN is 15 digits.


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.

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.

Toll-free telephone number

A 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.

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.

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