SIM808 GPRS/GSM+GPS+Bluetooth shield

Hello everyone !

I made project with SIM808 shield and STM32L152RE board. In this time, I trying to send voice message to remote phone by AT commands of this module. I trying set of commands for connection and record message in this order :

AT

ATD<number>;

AT+DTAM=2

AT+CREC=1,1,1,600,0,0

AT+CREC=2

AT+CREC=4,1,0,50,1

AT+CREC=5

ATH

After ATD command I get a phone call, answer it and hang up. The further process hangs and the commands are not executed. What I'm doing wrong ?

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