A2P SMS Gateway and API
Enterprise-grade A2P SMS gateway with direct SS7 carrier connections, sub-second OTP delivery and 99.95% uptime. Integrate our SMS API in minutes with SDKs for Python, Node.js, PHP, Java, Ruby, Go and .NET.
- Direct SS7 connections -- no grey routes
- Sub-second OTP and 2FA delivery
- 10DLC, SHAFT and TCPA compliant (USA)
- RESTful API with 10+ language SDKs
- Dedicated short codes and toll-free numbers
- 99.95% uptime SLA with real-time webhooks
- Official Meta Business Partner
- ISO 27001 and GDPR compliant
- 190+ countries direct carrier routes
- 99.9% uptime SLA guaranteed
- Free trial - no credit card needed
What Is A2P SMS Messaging?
A2P (Application-to-Person) SMS is text messages sent automatically from a business application to end-user phones -- OTPs, notifications, confirmations and marketing SMS. It uses dedicated infrastructure built for automated, high-volume delivery.
Market size: The global A2P SMS market is projected to reach $92 billion by 2027 (Juniper Research), driven by OTP demand from fintech and e-commerce.
Common A2P SMS Use Cases
- OTP and 2FA: One-time passwords for secure login and payment -- delivered in under 2 seconds
- Transactional: Order confirmations, delivery updates, booking alerts
- Appointment Reminders: Healthcare, beauty and professional services -- reducing DNA rates 40%
- Emergency Alerts: Government notifications and fraud warnings
BulkSMSHub A2P SMS API
Python SDK
pip install bulksmshub
Node.js SDK
npm install bulksmshub
PHP SDK
composer require bulksmshub/php-sdk
Java SDK
Maven and Gradle available
A2P Compliance: 10DLC and Global Regulations
USA: 10DLC (Mandatory Since Feb 2025)
All US A2P SMS must use 10DLC-registered long codes. Unregistered numbers are blocked by AT&T, T-Mobile and Verizon. BulkSMSHub handles complete 10DLC registration including brand registration, TCR campaign registration and carrier vetting.
Global Compliance
- India (TRAI/DLT): Entity ID, sender ID and template registration managed by BulkSMSHub
- UK (ICO/PECR): GDPR consent, TPS screening and opt-out management
- UAE (TDRA): Licensed sender IDs and content filtering enforced
- Australia (ACMA): Spam Act 2003 compliance with verified sender ID
Warning: Sending unsolicited A2P SMS is illegal and can result in significant fines. BulkSMSHub automates compliance in every supported market.
A2P SMS vs P2P SMS: Key Differences
Understanding the difference between A2P and P2P SMS is essential for choosing the right messaging infrastructure for your business:
| Feature | A2P SMS | P2P SMS |
|---|---|---|
| Sender | Business application | Individual person |
| Volume | Millions per day | Low volume |
| Infrastructure | Dedicated carrier routes | Consumer mobile network |
| Compliance | 10DLC, SHAFT, TCPA registered | No registration needed |
| Sender ID | Custom brand name or short code | Personal mobile number |
| Throughput | Hundreds per second | 1 per second |
| Deliverability | 98%+ guaranteed | Variable |
| Cost | $0.004–$0.05 per message | Consumer rate |
Why Businesses Must Use A2P SMS Infrastructure
Attempting to send bulk business messages over P2P consumer routes (e.g., using personal SIM cards) violates carrier terms of service and results in account suspension, number blocking and potential legal liability. A2P infrastructure provides the compliance controls, throughput capacity and deliverability guarantees that business messaging requires.
BulkSMSHub's A2P SMS gateway handles all carrier relationships, compliance registration and route optimisation — so your messages always arrive via legitimate, unblocked pathways. Combine with bulk SMS marketing campaigns or WhatsApp Business API for comprehensive business messaging coverage.
Frequently Asked Questions
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