SMS & Telecom Knowledge Base
In-depth guides on SMS infrastructure, carrier filtering, 10DLC registration, TCPA compliance, and programmable telecom for developers and businesses.
Technical reference guides covering how SMS works at the network level, carrier compliance requirements, and programmable telecom infrastructure.
| Guide | What You'll Learn |
|---|
| How SMS Works | PSTN, SS7, SMSC routing, and how messages travel from phone to phone |
| What Is A2P SMS? | Application-to-person messaging, P2P vs A2P classification, and regulatory treatment |
| What Is 10DLC? | The Campaign Registry, brand/campaign registration, trust scores, and throughput limits |
| Carrier SMS Filtering | How AT&T, Verizon, and T-Mobile analyze and filter SMS traffic |
| Short Code vs 10DLC vs Toll-Free | Comparing SMS sender types: cost, throughput, registration, and use cases |
| TCPA & CTIA Compliance | Federal law, industry policy, consent requirements, and opt-out rules |
| SHAFT+ Restricted Categories | Carrier-restricted content categories and how each layer enforces them |
| SMS Deliverability | Maximizing delivery rates, avoiding filters, and monitoring sender reputation |
| Guide | What You'll Learn |
|---|
| Glossary | Definitions for A2P, P2P, 10DLC, TCR, CPaaS, CAIP-2, EIP-3009, and 50+ more terms |