Recommended Application Field - Quectel GSM Series Audio Design Manual

GSM/GPRS Modules
GSM Module Audio Design Guide

3.1.3.2. Recommended Application Field

There are some recommended parameters when module works in voice or DTMF application, shown as
below:
Voice
AT+QAPS=1,4,0,"96.253.10756.31.57351.31.400.0.80.4325.99.0.20488.0.0.8192"
AT+QAPS=1,4,0,"128.253.10756.31.57351.31.400.0.80.4325.99.0.16392.0.0.8192"
AT+QAPS=1,4,0,"192.253.10756.31.57351.31.400.0.80.4325.99.0.16392.0.0.8192"
AT+QAPS=1,4,0,"192.253.10756.31.57351.31.400.0.80.4325.99.0.8223.0.0.8192"
AT+QAPS=1,4,0,"192.253.5256.31.57351.31.400.0.80.4325.99.0.8223.0.0.8192"
AT+QAPS=1,4,0,"192.253.2218.31.57351.31.400.0.80.4325.99.0.8223.0.0.8192"
AT+QAPS=1,4,0,"248.253.2218.31.57351.31.400.0.80.4325.99.0.8223.0.0.8192"
DTMF
AT+QAPS=1,4,2,"128.224.2218.31.57351.24607.400.132.80.4325.99.0.8223.0.0.0"
AT+QAPS=1,4,2,"192.224.750.31.57351.24607.400.132.80.4325.99.0.2079.0.0.0"
AT+QAPS=1,4,2,"224.224.511.31.57351.24607.400.132.80.4325.99.0.513.0.0.0"
AT+QAPS=1,4,2,"128.253.2218.31.57351.24607.400.132.80.4325.99.0.8223.0.0.0"
AT+QAPS=1,4,2,"192.253.750.31.57351.24607.400.132.80.4325.99.0.2079.0.0.0"
AT+QAPS=1,4,2,"224.253.511.31.57351.24607.400.132.80.4325.99.0.513.0.0.0"
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