Ringtone - Quectel GSM Series Audio Design Manual

Notes
1. Capacitors have to place close to audio component or audio interface and layout must be short.
2. Antenna interface must be stay away from audio components and layout of audio circuit. Layout of
power supply must be stay away from audio and cannot be parallel.
3. Differential audios have to meet the rule of layout.

2.2. Ringtone

M1x does not support ringtone via channel AOUT1, but support to output ringtone via channel AOUT2.
M95 outputs ringtone via channel AOUT2 by default.
M80 outputs ringtone via channel AOUT2 by default; channel AOUT1 can output ringtone via
AT+QAUDCH=0 and AT+QRCH=1. Please refer to AT command description for detailed information
about AT+QRCH.
AT+QRCH
Test Command
AT+QRCH=?
Read Command
AT+QRCH?
Write Command
AT+QRCH=<n>
Reference
Parameter
<n> 0
1
GSM Module Audo Design Guide
Response
+QRCH: (0,1)
OK
Response
+QRCH: <n>
OK
Response
OK
If error is related to ME functionality:
+CME ERROR: <err>
Default output channel is AOUT2. (M80's default audio channel is
AOUT2/AOUT3.
Output ringtone at any audio channel which is decided by AT+QAUDCH. (e.g. if
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