ESP-TEL is a single-chip, audio tele-conferencing solution based on Espressif’s ESP32-LyraT-Mini development board. No additional digital-signal processing (DSP) chip is needed. Only one ESP32 is used for the front-end speech recognition. This solution can simultaneously realize the functions of audio-conference calling, voice interaction and human-machine interface (HMI). ESP-TEL Resources 1. ESP32-LyraT-Mini Getting-Started Guide: 2. ESP VoIP is a telephone client based on the standard SIP protocol: 3. Espressif's Audio DevKits: 4. Espressif's Audio Development Framework: 5. Espressif's esp_sr provides basic algorithms for speech-recognition applications: 6. ESP Technical Documents: