SMS Delivery Status You Can Build Into Your Product
Get consistent delivery states even when underlying providers use different DLR codes. Alert21 translates provider responses into a stable status model for your application.
Normalized Status Model
Your integration should not need provider-specific DLR parsers. Alert21 maps upstream values into a documented set of message states.
Webhook-First Updates
Register a secure endpoint and receive signed event payloads when delivery state changes. Use polling only as a fallback or reconciliation mechanism.
Operational Visibility
- Alert21 Message ID.
- Recipient reference.
- Template reference.
- Submit time.
- Latest status.
- Delivery time where available.
- Error category.
- Webhook attempts.
DLR Limitations
Delivery receipts are produced by telecom/provider systems. Status can be delayed, updated later, unavailable on some routes or interpreted differently by upstream networks. Alert21 should normalize available data but must not promise perfect DLR accuracy.
Turn your next business event into a traceable alert.
Start with DLT-ready SMS today on Alert21’s developer-first communication platform.