prerm is in asterisk-core-sounds-it 1.4.27-1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #! /bin/sh -e
if [ "$1" = "remove" ]; then
update-alternatives --remove asterisk-prompt-it /usr/share/asterisk/sounds/it_IT_m_Carlo
update-alternatives --remove asterisk-prompt-it-it /usr/share/asterisk/sounds/it_IT_m_Carlo
fi
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