LTE Standard Module Series About the Document Revision History - 2021-04-08 Kevin WANG Creation of the document 1.0 2021-05-08 Kevin WANG First official release 1. Added applicable module: EG915U series. 2. Updated related description of audio channels (Chapter 1.1). 3. Updated related description of parameters for setting audio mode (Chapter 2.3.6). 4. Added AT+QWTTS (Chapter 2.3.9). 5. Added AT+QICMIC (Chapter 2.3.13). 6. Added AT+QICSIDET (Chapter 2.3.14). 7. Updated description of error codes (Chapter 3). 1.1 2021-09-01 Kevin WANG EC200U&EG915U_Series_Audio_Application_Note 3 / 25 Version Date Author Description