Record and Play audio File during a call with EC25

Hi everyone,

I’ve been unsuccessful in my attempts to record and play audio files on an EC25 modem. I’m unsure of what mistake I am making. The sequence as executed is the following:

AT+QFLST
+QFLST: “UFS:sound8khz.wav”,32826
+QFLST: “UFS:A.wav”,0
ATD;
OK (call is answered from my cell)
AT+QAUDRD=1,“record.wav”,13,0
OK
AT+QAUDRD=0
OK
AT+QFLST
+QFLST: “UFS:sound8khz.wav”,32826
+QFLST: “UFS:A.wav”,0
+QFLST: “UFS:record.wav”,23226
AT+QPSND=1,“record.wav”,0,1,1
OK (nothing happens, I cannot hear any audio)
ATH

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Some random settings of my modem:

AT+QGMR
EC25EFAR06A08M4G_01.007.01.007
AT=QDAI?
ERROR
AT+QDAI?
+QDAI: 3,0,0,4,0,0,1,1
OK
AT+CLVL?
+CLVL: 3
OK
AT+QAUDMOD?
+QAUDMOD: 4
OK
AT+QSIDET?
+QSIDET: 0
OK
AT+QPCMV?
+QPCMV: 0,0
OK

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I am feeling overwhelmed and unsure of where to begin debugging. Can someone please assist me?