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 :
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 ?
Can anybody to help me resolve NO DIALTONE problem ?
Into first call of ATD<number>; command I get this error. And into second call of ATD<number>; command modem is connected but I don't hear any voice message and it disconnected.
It solved and solved simply. I just added 2,000 msec delay for every command and it working ! :-)