In many Linux distributions the file /dev/modem is a symbolic link to the serial port containing a modem which is available for use.
Although the serial console is a serial port with a modem, we certainly don't want it used to place an outgoing call.
Check that /dev/modem does not point to the serial port being used for the console, say /dev/ttyS0. If it does, then remove the symbolic link.
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Created 1996-2023 by Maxim Chirkov
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