[M26] CME ERROR 4300 when use AT+QPSND

I used wav 8kHz (Mono, GSM 6.10) to use AT+QPSND and get CME ERROR 4300. What should I do?

Thanks in advance.

4300 error means the format is wrong. please check the file format once.
please convert your file into below format using any audio tool/online sites

attached Audio application note FYR.

Rahul mahakalkar
Quectel_GSM_Audio_Player_Application_Note_V3.2.pdf (854.9 KB)