Thanks, i had the command list, i just overlooked ATA (i was looking for "pick up" which was ATH1). No, the modem is just an USB dongle, no manuals.
I give these commands by hand via picocom, so the device got way more time than 1 second. Also sending SMS worked and now picking up works too, so i think it is not an initialization problem. It seems, that the voice support on this modem is broken: hardware is able, but the firmware is not. But thanks anyway.
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