> For the complete documentation index, see [llms.txt](https://smsc.revicom.ltd/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://smsc.revicom.ltd/how-to-work-with-smsc/readme.md).

# Introduction

The SMSC service is designed to send SMS messages and Flashcall. The service operates on the basis of the SMPP 3.4 protocol

SMPP protocol requires a client. For the most popular programming languages, there are freely distributed SMPP clients implemented as specialized libraries.

The following sections provide instructions and recommendations for working with SMSC.