Fundamentals BroadNet answer

What is A2P SMS?

Last reviewed August 8, 20261 min readReviewed by BroadNet engineering

Quick answer

A2P (application-to-person) SMS is a text message initiated by a business software application — for OTPs, notifications, alerts, transactional confirmations, marketing — delivered to a consumer mobile phone. A2P is the dominant business-messaging modality globally, with over 2 trillion A2P messages sent per year.

Plain-language definitionVendor-neutralReviewed August 8, 2026

DiagramHow an A2P message reaches the phone

Your applicationSends over the REST API or SMPP
BroadNet platformValidates, routes and bills each message
Operator SMSCDirect operator connection
Subscriber handsetThe message is delivered

The delivery receipt (DLR) travels back along the same path to your webhook

The long answer

Everything worth knowing, nothing that isn't.

§01

How A2P SMS works

An enterprise application calls a CPaaS or SMS API (like BroadNet's). The CPaaS routes the message through its SMSC to a mobile network operator via SMPP, SS7, or HTTP. The operator's SMSC delivers to the recipient's handset. A delivery receipt comes back through the same path.

§02

A2P vs P2P SMS

P2P is text from one person to another via their mobile dial-pad. A2P is sent by software to a person. A2P is regulated, monetized, and routed differently from P2P — A2P routes have higher operator fees but high, operator-direct deliverability.

§03

What's a grey route?

A grey route is A2P traffic that bypasses official A2P agreements by appearing as P2P — using consumer SIMs, foreign HLRs, or SS7 backdoors. Grey routes deliver but are unreliable, untraceable, and cost operators billions in lost revenue. BroadNet operates on direct A2P routes only.

BNWritten by the BroadNet engineering team·Operating carrier-grade messaging since 2003, headquartered in Dubai·Editorial standards

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