Search the glossary for all frequently used terms

A2P Messaging

A2P stands for Application to Person messaging. These are messages that are sent from an application to a person, for example One Time Passwords, bank alerts or booking confirmations by means of API or Web App.


An API, or Application Programming Interface in full, allows you to let systems interact with one another. By integrating one of CM’s API’s in your own software, you can use any of the CM features in your existing system. API integration is generally done by developers.

Alphanumeric Sender ID

The sender ID refers to the "from", so who has sent the message. This can be alpha (containing characters and numbers), numeric (only numbers) or a numeric short code.


CM Authenticator is a mobile Two-Factor Authentication method via mobile app (Push) and SMS. Authenticator can be used via plugins (for Microsoft, WordPress etc.) or our API and allows your user to accept or decline a login session from his mobile phone in just one click.


This payment product allows you to automatically collect and follow-up payments in terms. AutoCollect processes the payments and automatically retries failed payments in the most efficient way.


A Communications Platform as a Service (CPaaS) is a a cloud based platform that provides enterprises’ developers with the ability to add communication services to their own applications. Because is a CPaaS, you can implement our products, such as SMS, Voice, Chat apps and One Time Passwords, without having to develop your own communication solutions.

Carrier Billing

Direct Carrier Billing is an online payment method which allows users to make a purchase by charging payments to their mobile phone bill. Carrier Billing is available for all consumers with a mobile device containing a SIM card.


A DLR refers to a status of a sent message. Once the message has been received (or not) within the 48-hour retry range, the sender (company or aggregator) receives a Delivery Status Report with detailed information about the processed message.

DTMF tones

Dual Tone Multi Frequency is a method often used in IVR systems to choose menu items or enter codes. DTMF is widely used for telecommunication signalling over analog telephone lines in voice-frequency bands, and is used in push-button telephones for tone dialling.

Dedicated shortcode

A dedicated short code is used to enable companies to send messages with a specific short code dedicated only for their business and enabling response for the end user to that same number (Sender ID). Though CM offers several shared shortcodes such as 3669 you can use, you can also request a specific shortcode for your business. An example of such a dedicated shortcode is the shortcode 3333 for Dutch radio station 3FM.

Direct Dial In (DDI)

Direct Inward Dialing (DID) or Direct Dial In (DDI) is a service of a local phone company or local exchange carrier that provides a block of telephone numbers for calling into a company’s private branch (PBX) or IP telephony system. Using DDI, a company can offer its customers individual phone numbers for each individual or workstation within the company without requiring a physical line into the PBX for each possible connection.

Direct Inward Dialing (DID)

See Direct Dial In (DDI).


External Short Messaging Entities or ESMEs are external applications that connect to an SMS service for sending and receiving SMS messages. Examples of ESME’s are voting systems or automated marketing messages.

Email Campaigns

Email Campaigns is a CM messaging solution which enables you to reach large lists of people with an HTML email which you can customise and personalise. This product also gives you a clear insight in your campaigns’ results.

Fake DLR’s

Fake DLR’s are a known problem amongst aggregators. In a fake DLR, the supplier of a connection falsely reports a successful delivery to an end-user device. This results in loss of money, because companies pay for messages that are never delivered on a handset.


The General Data Protection Regulation is a EU-regulation that prescribes what precautionary measures companies must take to protect citizens from privacy and data breaches, including how to handle breach notifications.

GIN Customer Contact

A multi user dashboard to connect your customer service center to the OTT chat network such as Facebook Messenger, WhatsApp and WeChat. With GIN, you can communicate with customers via all the messaging apps they’re already using from one platform, adding features like quick replies, tags and chatbots for better customer care.


Home Location Register (HLR) is an MNO database containing all information related to a mobile subscriber’s device. CM uses HLR for its Number Lookup feature, allowing you to verify number information and prevent fraud.

Hybrid (Hybrid Messaging)

Hybrid messaging enables you to send push messages with SMS as fall-back. Mobile messages will be sent via the cost-effective push messaging. If the receiver doesn’t have your app installed or is offline, the message is sent via SMS. This way you’ll realise the highest reach at the lowest cost. If you don't have your own app, you can use CM's Notifire app.


International mobile subscriber identity, unique for every SIM card. The IMSI code is related to one SIM card, so even if the phone number is used again by another user, the sim card will be printed again and with that it will receive a new IMSI Code.


JavaScript Object Notation is one of the programming languages.

Long Code

Long code stands for a regular MSISDN number virtualised and enabled for usage in Two-way messaging. So, you have a regular number that is linked to a system which you can use for interactions with the end users. These can be dedicated or shared the way Uber does.


The dedicated code with which particular mobile operators are identified.


Mobile Network Operators such as Vodafone, China Mobile and Airtel.


MNP stands for Mobile number portability. A phone number registered on one network, moves the same number service to another Network (T-mobile to Vodafone NL). During the transferring process, the end user gets a new SIM card printed containing an IMSI code from the new network, which helps Telco companies do proper routing for traffic in voice, SMS, etc.


The Mobile Station International Subscriber Directory Number is a number used to identify mobile subscribers, and maps the mobile telephone number to a SIM card in a mobile phone.

Mail SMS

An easy to implement messaging solution with which you can send out SMS messages from your email account.

Mobile Originated (MO)

Mobile communication where the message is sent from an end user to an application.

Mobile Terminated (MT)

Mobile communications where the message is sent from an application to an end user.

Number Verifier

An HLR based solution to help you optimise routing, to clean up a database of numbers for improved accuracy or to prevent ATM card cloning fraud.

Numeric Sender ID

These sender IDs consist of solely numeric characters.


OTP is the abbreviation of One Time Password and is a string of characters or numbers automatically generated to be used for one single login attempt. These can be sent to the user’s phone via SMS or Push messaging. OTP’s will minimize the risk of fraudulent login attempts and thus the risk of stolen data.


OTT or Over The Top refers to third party content that is sent directly to the end user, where the ISP facilitates the transport of the IP packets. Examples are Skype, WhatsApp and FaceTime.

P2P Messaging

Person to Person Messaging is SMS messaging between two people, including traffic that connects two people through an API. P2P messaging is used for, amongst others, customer care or order delivery messages.


CM is an internationally operating Payment Service Provider (PSP), which means its payments branch CM Payments offers connectivity to multiple payment methods including VISA, MasterCard, Paypal, iDeal, Microincasso and Bancontact.

Push (Certa Push)

Push is a messaging solution with which you can send large batches of Push messages to your app(s). Our Push messaging solution by Certa allows you use filters and preferences to fine-tune your notifications for your audience.

Radio chat

An intuitive dashboard that lets radio DJ’s interact with their audience, organising incoming text messages in peak volume.


A Software Development Kit (SDK) is a collection of tools that allow you to build your own software with implemented CM.


The Subscriber Identity Module presents the SIM card used to enable communication over a telecommunication network for a device (smartphone, tablet, etc.)

SIP Trunk

The Session Initiation Protocol enables you to use multimedia communication like voice and video calls using VOIP. Using SIP instead of traditional telephony means you’ll cut down on your communication costs.

SMS Campaigns

Online mobile marketing solution to reach a large target audience with a personalised message. Our intelligent tracking tool allows you to see who converted to your message.

SMS Gateway

CM's SMS Gateway enables you to send text messages to mobile phones all around the world. To integrate this functionality into your application, you (or your developers) should implement communication with our API.


The SMS Center, usually the end party, that delivered the message to the handset.

Send/Receive apps

This is an easy to use web app to send SMS/Hybrid messages to individuals or lists, and allow them to send replies.

Short Code

Short codes are significantly shorter digit sequences than regular phone numbers, mostly 3 to 5 digits. Because such shorter numbers like 3333 are easier to remember, such short codes are often used by charities, television voting and other commercial purposes. CM can provide you with several short codes.


An SMS test tool which lets SMS aggregators, MNO`s and MVNO`s check the quality of SMS routes, using live nodes, limiting the risk of whitelisting and grey routes.

Two-Factor Authentication (2FA)

The risk of fraud is drastically reduced if the user doesn’t only have to fill in his user name and password (something he knows) but also needs something he “has” -like his mobile phone- to complete the login. This second factor of authentication can be, for example, a One Time Password or CM Authenticator.

Two-way Messaging

Enable replies so you can receive SMS message from your users via short codes, or long numbers. You can set automated actions for each message.


VOIP, or Voice over IP, an IP network like the internet is used to transfer speech. This enables you to connect speech and data.

Virtual phone number

Virtual phone numbers are not directly terminated, but rather forwarded to another number. With a Virtual phone number you can have a Dutch number which forwards to a US one, so a US company has a "virtual" number in the Netherlands. These virtual phone numbers can be provided by CM.

Voice API

With CM’s Voice API, any developer can create and maintain call flows. You won’t need to integrate voice systems yourself to build IVR applications.

Voice Notification API

This voice API converts text to speech and is much used for notifications and Two-factor Authentication. Voice notification is available through API and our platform and consists of notifications (call, play and hang up), OTP and Get DTMF apps.

Voice Wizard

The CM Webtool to create simple IVR Inbound campaigns. Upload and sort voice prompts, design scenarios and get reporting.

Web app

Besides API and SDK integration, CM offers most products as web apps as well. By using the web apps on our platform, you’ll gain easy access to all CM’s products for messaging, payments, voice and authentication.


Testing SMS routes with the same numbers, as done with SIM boxes, results in Whitelisting. This means that algorithms will determine these numbers as priority numbers. Whitelisting of mobile numbers gives a distorted view of messaging delivery rates and route quality.