You can test the audio path with the toolkit tones. These are tones that mimic what some phone services sound like. For a full list of tones, you can check the '''AT+STTONE''' command in the AT command datasheet. We'll use tone #20 which is the American dial tone. | You can test the audio path with the toolkit tones. These are tones that mimic what some phone services sound like. For a full list of tones, you can check the '''AT+STTONE''' command in the AT command datasheet. We'll use tone #20 which is the American dial tone. |