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If you're new to A2P 10DLC messaging, it doesn't take long before you're buried in acronyms.
Between registration requirements, carriers, messaging providers, and compliance terms, understanding the language of the ecosystem is often half the battle.
To help, we've compiled 12 of the most common A2P 10DLC acronyms and what they actually mean.
A2P stands for Application-to-Person messaging. It refers to text messages sent from a software application to an individual recipient.
Common examples include:
Today, most business text messaging traffic in the United States is classified as A2P messaging.
10DLC stands for 10-Digit Long Code and refers to local phone numbers used for business messaging throughout North America.
Unlike traditional long codes designed for person-to-person communication, 10DLC numbers are approved for A2P messaging when properly registered through The Campaign Registry (TCR). These numbers use familiar regional area codes, allowing businesses to maintain a local presence while benefiting from carrier-approved messaging capabilities.
For many ISVs and SaaS platforms, 10DLC has become the standard channel for business texting because it combines familiarity, scalability, and broad carrier support.
The Campaign Registry (TCR) is the central registration authority for A2P 10DLC messaging in the United States.
TCR works with wireless carriers, Campaign Service Providers (CSPs), and Direct Connect Aggregators (DCAs) to establish trust and transparency throughout the messaging ecosystem.
Before businesses can send A2P 10DLC traffic, they must register their Brand (who is sending messages) and Campaign(s) (what messages are being sent) through TCR.
Today, TCR serves as the foundation of A2P 10DLC registration and compliance, helping carriers verify sender identity and reduce unwanted messaging traffic.
A Campaign Service Provider (CSP) is an organization authorized to create and manage Brands and Campaigns within The Campaign Registry.
For ISVs, becoming a CSP provides greater ownership, visibility, and control over customer registrations. CSPs can directly manage registration workflows, access registration data, and maintain ownership of Brands and Campaigns throughout their lifecycle.
A Connectivity Partner (CNP) is a messaging provider that has direct connections to wireless carriers and supports the delivery of registered A2P 10DLC traffic.
Connectivity Partners play an important role in the messaging ecosystem by helping route messages, maintain carrier relationships, and support registration workflows. Many providers work with one or more CNPs to deliver messaging traffic across carrier networks.
As messaging requirements continue to evolve, the strength of a provider's carrier and connectivity relationships can have a significant impact on registration speed, deliverability, and operational reliability.
Telgorithm is an example of a CNP.
A Direct Connect Aggregator (DCA) connects registered Campaigns to participating wireless carriers.
DCAs are responsible for:
Many messaging providers work with one or more DCAs behind the scenes to facilitate registration and message delivery.
An MNO is a wireless carrier that operates its own cellular network.
Examples include:
Each carrier establishes its own messaging policies, throughput limits, and compliance requirements.
SMS is the standard text messaging format that supports text-only messages.
SMS remains one of the most widely used communication channels because it works across virtually all mobile devices and networks.
MMS allows businesses to send rich media content, including:
Many marketing and customer engagement campaigns rely on MMS to increase visibility and engagement.
Rich Communication Services (RCS) is the next generation of mobile messaging.
RCS supports features such as:
While RCS adoption continues to grow, SMS and MMS remain important because they provide fallback coverage when RCS is unavailable.
RCS Business Messaging (RBM) refers to business communications sent over Rich Communication Services (RCS).
RBM enables businesses to create branded, interactive messaging experiences that can include rich media, suggested replies, carousels, and action buttons directly within a user's native messaging application.
As adoption grows, many organizations are incorporating RCS Business Messaging alongside SMS and MMS to provide richer customer experiences while maintaining fallback coverage for unsupported devices and networks.
SHAFT is a content classification used throughout the messaging industry for disallowed content.
It stands for:
Content involving SHAFT categories is heavily restricted or prohibited on many messaging channels and often requires additional review or specialized approval processes.
A2P 10DLC registration is no longer optional. As carriers continue to increase compliance requirements and messaging oversight, understanding the terminology behind the ecosystem becomes increasingly important.
Whether you're registering your first Campaign, evaluating messaging providers, or preparing to launch new channels like RCS, a strong grasp of these foundational concepts can help you navigate the process more confidently.
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