Problem with disconnecting outgoing calls from SIM800L

I have a problem with the sim800L . If I give the command ATD + 48xxxxxxx; I cannot force the module to cancel an outgoing connection. The ATH command does not work. If the outgoing call is answered I can then hang up, but I emphasize that the call must be answered. I would like to add that when connecting to the selected number, the module does not accept any commands until the call is received from sim800L. I use arduino mega2560. I try to disconnect the outgoing connection with the ATH command from the serial port level and from the Serial1.print (F ("ATH)) program; but unfortunately to no avail. How to force the module to cancel the connection? firmware version: 1418B05SIM800L24

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