ԲΠ= DTMF
Çàïèòàííÿ:https://www.activexperts.com/serial-port-component/at/dtmf/
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ANSWER ====================================
http://codius.ru/articles/GSM_ìîäóëü_SIM800L_÷àñòü_4
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ANSWER ====================================
https://www.reddit.com/r/AskProgramming/comments/97zrnd/trying_to_send_audio_using_a_gsm_modem_in_a_voice/
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ANSWER ====================================
https://circuitdigest.com/microcontroller-projects/automatic-call-answering-machine-using-arduino
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