Understanding SMS and telecom abbreviations is important for anyone using BulkSMSOnline.com for SMS marketing, OTP messages, customer notifications, delivery reports, routing, number validation, API integration, or international SMS campaigns.

 

This glossary explains common terms used in the telecommunication, mobile network, and SMS marketing industry. These definitions can help businesses, developers, resellers, marketers, and support teams better understand SMS reports, API responses, routing details, number lookup results, and message delivery behavior.

 

Basic SMS and Telecom Terms

1. SMS - Short Message Service

SMS stands for Short Message Service. It is the standard technology used to send text messages between mobile phones, applications, and SMS gateways. Businesses use SMS for marketing campaigns, OTP verification, customer alerts, appointment reminders, payment notifications, and transactional updates.

 

2. Bulk SMS

Bulk SMS means sending text messages to many recipients at the same time. Businesses use bulk SMS to reach customers quickly for promotions, alerts, reminders, updates, and notifications. You can learn more on the Send Bulk SMS Online page.

 

3. A2P SMS - Application-to-Person SMS

A2P SMS refers to messages sent from an application or business system to a person. Examples include OTP codes, banking alerts, delivery updates, appointment reminders, and marketing SMS campaigns.

 

4. P2P SMS - Person-to-Person SMS

P2P SMS refers to messages sent from one person to another, usually from a mobile phone. This is different from business or application-based SMS traffic.

 

5. OTP - One-Time Password

OTP is a temporary code sent to users for verification or authentication. OTP SMS is commonly used for login security, payment confirmation, account registration, and password reset flows.

 

6. 2FA - Two-Factor Authentication

2FA is a security method that requires users to verify their identity using a second step, such as an SMS OTP code. Businesses can use SMS verification solutions to help protect user accounts and online transactions.

 

Numbering and Country Code Terms

7. MCC - Mobile Country Code

MCC stands for Mobile Country Code. It is a unique numeric code used to identify a country in mobile networks. MCC is used together with MNC to identify a mobile network operator.

 

8. MNC - Mobile Network Code

MNC stands for Mobile Network Code. It identifies a mobile network operator inside a country. When MCC and MNC are used together, they help identify the exact mobile network.

 

9. ISO Country Code

ISO country codes are standardized country identifiers. In telecom and SMS reports, ISO usually refers to ISO 3166 country codes, such as MY for Malaysia, US for United States, GB for United Kingdom, and AE for United Arab Emirates.

 

10. CC - Country Code

CC stands for Country Code. In SMS and telecom, it usually refers to the international dialing code used before a phone number, such as 60 for Malaysia, 1 for the United States, or 44 for the United Kingdom.

For international SMS, numbers should normally be entered in full international format with the country code.

 

11. E.164 Format

E.164 is the international telephone numbering format used for global phone numbers. It helps ensure that phone numbers are written in a format that can be recognized internationally.

Example:

  • Correct international format: 12025550101
  • Incorrect local format: 025550101

 

12. MSISDN - Mobile Station International Subscriber Directory Number

MSISDN is the full international mobile phone number used to identify a mobile subscriber. In simple terms, it is the recipient’s mobile number including the country code and subscriber number.

 

13. NDC - National Destination Code

NDC is part of a phone number that can identify a national destination, mobile operator range, or area inside a country. In SMS routing and number validation, it can help identify where a number belongs.

 

14. Prefix

A prefix is the beginning part of a phone number after the country code. Prefixes may help identify mobile operators, regions, or number ranges. However, because of mobile number portability, the original prefix may not always show the current network.

 

Network and Lookup Terms

15. Net Name - Network Name

Net Name refers to the mobile network name associated with a phone number. It may appear in SMS reports, number validation results, MNP lookup results, or routing information.

 

16. Operator

An operator is the mobile network company that provides service to a mobile number. Examples include national telecom carriers and mobile network providers.

 

17. MNP - Mobile Number Portability

MNP allows users to move their mobile number from one operator to another while keeping the same phone number. This means the number prefix may show the original operator, but the current network may be different.

Businesses can use MNP Lookup to help identify portability-related information where available.

 

18. HLR - Home Location Register

HLR is a mobile network database that stores subscriber-related information. HLR lookup can help identify useful telecom information such as current network, roaming status, and whether a number may be active or reachable where supported.

 

19. MNV - Mobile Number Validation

MNV stands for Mobile Number Validation. It helps check whether a phone number is valid, correctly formatted, and associated with the expected country or operator data. You can learn more on the Number Validation page.

 

20. Roaming

Roaming means a mobile subscriber is connected to a network outside their home network, often while travelling. Roaming can sometimes affect SMS delivery speed, cost, or delivery report behavior.

 

21. Ported Number

A ported number is a mobile number that has been moved from one operator to another. Ported numbers can affect SMS routing because the number may no longer belong to the original network.

 

SMS Delivery and Reporting Terms

22. DLR - Delivery Report

DLR stands for Delivery Report. It shows the status of an SMS after it has been submitted, such as delivered, pending, failed, rejected, expired, or undelivered.

Delivery reports help businesses monitor campaign performance and troubleshoot delivery issues.

 

23. Delivered

Delivered means the SMS was confirmed as delivered to the recipient’s mobile device or mobile network where final delivery confirmation is supported.

 

24. Submitted

Submitted means the SMS was accepted by the SMS gateway or route for processing. It does not always mean the message has reached the customer yet.

 

25. Pending

Pending means the SMS is still waiting for a final delivery response from the route, operator, or destination network.

 

26. Failed

Failed means the SMS could not be delivered. Possible reasons include invalid number, unsupported destination, insufficient credits, blocked content, sender ID restrictions, route issue, or recipient network problem.

 

27. Rejected

Rejected means the SMS was refused by the SMS gateway, route, or operator. This can happen because of invalid parameters, restricted content, sender ID rules, number format issues, or country-specific restrictions.

 

28. Expired

Expired means the SMS could not be delivered within the allowed delivery window. This may happen if the recipient phone is off, out of coverage, unreachable, or unavailable for a long time.

 

29. Message ID

A Message ID is a unique reference number assigned to an SMS after submission. It is useful for tracking, delivery reports, support checks, API responses, and troubleshooting.

 

30. Campaign ID

A Campaign ID is a unique reference for a bulk SMS campaign. It helps users track a group of messages sent together.

 

31. Error Code

An error code is a system or route response that explains why an SMS failed, was rejected, or could not be processed. Developers should check error codes carefully when using SMS API integration.

 

SMS Gateway, API, and Protocol Terms

32. SMS Gateway

An SMS gateway is a platform that connects businesses, applications, and systems to mobile networks so they can send and receive SMS messages.

BulkSMSOnline provides an SMS gateway for web dashboard sending, API integration, routing, delivery reports, and international SMS campaigns.

 

33. API - Application Programming Interface

An API allows software systems to communicate with each other. In SMS, an API allows your website, CRM, app, billing system, or backend platform to send messages automatically through an SMS gateway.

BulkSMSOnline supports multiple API options through the Bulk SMS API Developers page.

 

34. HTTP API

HTTP API is a simple URL-based integration method that allows systems to send SMS messages by passing required parameters through an HTTP request.

 

35. REST API

REST API is a modern API style commonly used with JSON requests. It is suitable for web applications, SaaS platforms, mobile apps, CRMs, and automated SMS workflows.

 

36. SMPP - Short Message Peer-to-Peer

SMPP stands for Short Message Peer-to-Peer. It is a telecom protocol commonly used for high-volume SMS traffic, carrier-grade messaging, aggregators, resellers, and enterprise systems.

 

37. SMSC - Short Message Service Center

SMSC is the system inside a mobile network that stores, forwards, and processes SMS messages. It plays an important role in sending messages between the SMS gateway and the recipient’s mobile network.

 

38. ESME - External Short Message Entity

ESME is an external application or system that connects to an SMSC using SMPP. In simple terms, it can be the customer’s SMS platform, gateway, or software that submits messages to the SMS network.

 

39. PDU - Protocol Data Unit

PDU is a structured data packet used in telecom protocols such as SMPP. It contains the request or response information exchanged between systems.

 

40. Webhook

A webhook is a callback URL that receives automatic updates from another system. In SMS, webhooks are often used to receive delivery reports, status updates, or inbound SMS notifications.

 

41. Callback URL

A callback URL is the web address where delivery reports or status updates are sent. Developers should make sure callback URLs are active, secure, and able to receive POST or GET requests based on the API setup.

 

SMS Direction and Message Flow Terms

42. MT SMS - Mobile Terminated SMS

MT SMS means a message sent to a mobile phone. Most business SMS campaigns, OTP messages, alerts, and reminders are MT messages.

 

43. MO SMS - Mobile Originated SMS

MO SMS means a message sent from a mobile phone to a business number, shortcode, long code, or SMS platform. It is often used for replies, opt-outs, voting, surveys, and two-way SMS communication.

 

44. Inbound SMS

Inbound SMS refers to messages received from customers. Businesses can use inbound SMS for replies, support, confirmation messages, opt-outs, and two-way communication.

 

45. Outbound SMS

Outbound SMS refers to messages sent from a business or system to customers. Examples include marketing SMS, OTP codes, reminders, alerts, and notifications.

 

Sender ID and Originator Terms

46. Sender ID

Sender ID is the name or number shown as the sender of an SMS. Some countries support custom sender IDs, while others require pre-registration, approval, or operator replacement.

 

47. Alphanumeric Sender ID

An alphanumeric sender ID uses letters and numbers instead of a phone number. For example, a business may use a brand name as the sender ID where supported.

 

48. Numeric Sender ID

A numeric sender ID uses digits as the sender. This may be a long code, shortcode, virtual number, or another approved sender number depending on the country and route.

 

49. Originator

Originator is another term for the sender of an SMS. It can refer to the sender ID, sender number, brand name, or source system used to send the message.

 

50. Short Code

A short code is a short numeric sender number used for SMS campaigns, two-way messaging, opt-ins, alerts, and high-volume communication in some countries. Short codes often require registration and approval.

 

51. Long Code

A long code is a normal-length phone number used for SMS communication. It may be used for two-way messaging, alerts, and customer communication depending on country rules.

 

SMS Route and Delivery Quality Terms

52. SMS Route

An SMS route is the path your message takes from the SMS gateway to the recipient’s mobile network. Route selection can affect delivery speed, sender ID behavior, delivery reports, reliability, and cost.

You can learn more on the SMS Routing page.

 

53. Direct Route

A direct route is usually a higher-priority SMS route designed for stronger delivery performance and faster message delivery. It is often used for OTP, alerts, and important notifications.

 

54. High Quality Route

A high quality route is a balanced option for businesses that need good delivery performance at a more flexible cost. It can be suitable for customer updates, reminders, notifications, and marketing campaigns.

 

55. Wholesale Route

A wholesale route is usually a cost-focused route for higher-volume SMS sending. Delivery performance, sender ID behavior, and reporting may vary depending on the destination and route conditions.

 

56. Latency

Latency refers to the time delay between submitting an SMS and the message reaching the destination network or recipient. Lower latency is important for OTP, verification, and urgent alerts.

 

57. Throughput

Throughput means how many SMS messages can be submitted or processed within a specific time period.

 

58. TPS - Transactions Per Second

TPS measures the number of SMS submissions or transactions processed per second. SMPP and enterprise integrations often use TPS limits to manage high-volume traffic.

 

59. Retry

Retry means the system attempts to resend or process a message again after a temporary failure, depending on route behavior, validity period, and SMS platform settings.

 

60. Validity Period

Validity period is the maximum time the SMS network may keep trying to deliver a message before marking it as expired. It is useful when the recipient phone is off, out of coverage, or temporarily unavailable.

 

Message Encoding and SMS Parts

61. GSM-7

GSM-7 is the standard character encoding commonly used for English SMS messages. It supports many Latin characters and allows up to 160 characters in a single SMS part.

The GSM 7-bit default alphabet is defined in telecom standards such as 3GPP TS 23.038.

 

62. Unicode

Unicode is used when messages contain characters outside the standard GSM alphabet, such as Arabic, Chinese, emojis, some symbols, or special characters. Unicode SMS usually allows fewer characters per SMS part.

 

63. UCS-2

UCS-2 is a character encoding commonly used for Unicode SMS. It allows non-GSM characters but reduces the character limit, usually to 70 characters for one SMS part.

 

64. SMS Part

An SMS part is one billable segment of a message. A standard GSM SMS can contain up to 160 characters in one part. Long messages may be split into multiple parts and charged based on the total parts used.

 

65. Concatenated SMS

Concatenated SMS is a long SMS that is split into multiple parts and reassembled on the recipient’s phone as one complete message where supported.

 

66. UDH - User Data Header

UDH stands for User Data Header. It contains technical information used to join long SMS parts together. Because UDH uses some message space, concatenated SMS parts have fewer available characters than a single SMS.

 

67. Flash SMS

Flash SMS is a message type that may appear directly on the recipient’s screen instead of being stored in the inbox. Availability depends on route, country, device, and operator support.

 

Compliance and SMS Marketing Terms

68. Opt-In

Opt-in means a customer has agreed to receive SMS messages from your business. Opt-in is important for responsible SMS marketing and compliance with local rules.

 

69. Opt-Out

Opt-out means a customer can unsubscribe or stop receiving SMS messages from your business. Marketing campaigns should respect customer opt-out requests.

 

70. STOP Keyword

STOP is a common keyword customers can send to unsubscribe from SMS messages where two-way SMS and opt-out handling are supported.

 

71. DND - Do Not Disturb

DND refers to customers or numbers that may be restricted from receiving promotional messages in some countries. DND rules vary by country and mobile operator.

 

72. Consent

Consent means the recipient has permitted your business to contact them by SMS. Businesses should only send marketing messages to users who have provided valid permission where required by local regulations.

 

73. Spam Filter

A spam filter is a network or platform-level filter that may block suspicious, misleading, restricted, or non-compliant SMS content. Content, sender ID, links, and traffic pattern can affect filtering.

 

Reports and Dashboard Terms

74. SMS Summary

SMS Summary is a report that gives an overview of sent messages, countries, operators, dates, costs, and campaign activity.

 

75. MNP Lookup Report

An MNP Lookup Report shows portability and network-related information, such as ported number status, network name, roaming status, and lookup response details where available.

 

76. Number Validation Report

A Number Validation Report shows validation results for phone numbers, including country code, network name, line type, operator details, and whether the number appears valid where supported.

 

77. Dashboard

The dashboard is the user area where you manage SMS campaigns, contacts, templates, credits, delivery reports, lookup results, and account activity.

 

Why These SMS Abbreviations Matter

Understanding these SMS and telecom abbreviations can help businesses:

  • Read SMS delivery reports correctly.
  • Understand API responses and error codes.
  • Choose the correct SMS route.
  • Prepare numbers in proper international format.
  • Improve campaign delivery performance.
  • Reduce failed SMS attempts.
  • Use number validation and MNP lookup more effectively.
  • Control SMS costs by understanding message parts and encoding.
  • Follow sender ID, content, and opt-out requirements more carefully.

 

Useful BulkSMSOnline Resources

You can learn more about BulkSMSOnline services through these pages:

 

Frequently Asked Questions

What is MCC in SMS?

MCC stands for Mobile Country Code. It identifies the country of a mobile network and is used together with MNC to identify a specific operator.

What is MNC in telecom?

MNC stands for Mobile Network Code. It identifies the mobile network operator within a country.

What is MSISDN?

MSISDN is the full international mobile phone number used to identify a mobile subscriber. It normally includes the country code and subscriber number.

What is a DLR in SMS?

DLR stands for Delivery Report. It shows the delivery status of an SMS, such as delivered, pending, failed, rejected, or expired.

What is SMPP?

SMPP stands for Short Message Peer-to-Peer. It is a protocol used for high-volume SMS messaging between SMS applications, gateways, and message centers.

What is GSM-7?

GSM-7 is the standard SMS character encoding used for many English and Latin alphabet messages. It allows up to 160 characters in one standard SMS part.

What is Unicode SMS?

Unicode SMS is used when a message contains characters outside the GSM-7 alphabet, such as Arabic, Chinese, emojis, or special symbols. Unicode messages usually allow fewer characters per SMS part.

What is MNP Lookup?

MNP Lookup helps identify mobile number portability and current network information where available.

What is Number Validation?

Number Validation checks whether a phone number is valid, properly formatted, and associated with the correct country or network information where supported.

Why are SMS abbreviations important?

SMS abbreviations help businesses understand delivery reports, API responses, routing, sender ID behavior, number validation, message encoding, and telecom network information.