LTE Standard Module Series 1 Introduction This document introduces audio related AT commands on Quectel LTE standard EC200U series and EG915U series modules. 1.1. Audio Channels The audio channels can be switched by AT+QAUDMOD . See Chapter 2.3.6 for details. Table 1: Module Supported Audio Channels EC200U Series speaker EG915U Series handset, headset EC200U&EG915U_Series_Audio_Application_Note 6 / 25 NOTE Only EC200U-CN and EG915U-CN modules support TTS function. Module Series Supported Audio Channels