# What is SMPP?

> SMPP (Short Message Peer-to-Peer) is the open-protocol standard for exchanging SMS between SMSCs, ESMEs (External Short Message Entities), and aggregators. Version 3.4 is the most widely deployed; 5.0 adds Unicode-clean headers. BroadNet supports both via plain TCP and TLS.

- Canonical URL: https://www.broadnet.me/answers/what-is-smpp
- Language: en
- Last reviewed: 2026-07-20
- Publisher: BroadNet (https://www.broadnet.me)

## Related

- [All answers](https://www.broadnet.me/answers)
- [Glossary](https://www.broadnet.me/answers)
- [How do you send an SMS via API?](https://www.broadnet.me/answers/how-to-send-sms-via-api)
- [What is SMPP window size?](https://www.broadnet.me/answers/what-is-smpp-window-size)
- [How does the SMPP protocol work?](https://www.broadnet.me/answers/smpp-protocol)
- [SMPP 3.4 vs SMPP 5.0 — what changed and what to use](https://www.broadnet.me/answers/smpp-3-4-vs-5-0)
- [What is an ESME?](https://www.broadnet.me/answers/what-is-esme)
- [SMS API](https://www.broadnet.me/products/sms-api)
- [SMPP integration](https://www.broadnet.me/developers/smpp)
- [SMPP error-code lookup](https://www.broadnet.me/tools/smpp-error-codes)