> For the complete documentation index, see [llms.txt](https://developer.unecast.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.unecast.com/smpp-api.md).

# SMPP API

This guide provides all the information you need to integrate SMPP into your applications for sending and receiving SMS messages efficiently and reliably.

## Useful Resources

* SMPP V5 - <https://smpp.org/SMPP_v5.pdf>
* SMPP V5 DLR - <https://smpp.org/smpp-delivery-receipt.html>
* SMPP Error Codes - <https://smpp.org/smpp-error-codes.html>