Custom Telephony on Your Own Hardware: SMS via GSM Gateway and Calls from FreePBX to Telegram

The author shares their experience building a custom telephony system using GoIP hardware. The project resulted in three key components: a server for managing GSM gateways, a cross-platform client for Android, iOS, desktop, and web, and a gateway that enables FreePBX internal extensions to make calls directly to Telegram. This solution allows for seamless integration between traditional PBX systems and modern messaging apps. The article details the technical implementation, highlighting the benefits of using proprietary hardware to ensure independence and flexibility in communication infrastructure. The project demonstrates the potential for automating SMS services and bridging traditional telephony with modern platforms, providing a valuable resource for system administrators and developers looking to optimize corporate communication systems.