prerm is in asterisk-core-sounds-en-gsm 1.4.21-1.
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 | #! /bin/sh -e
update-alternatives --remove asterisk-prompt-en /usr/share/asterisk/sounds/en_US_f_Allison
update-alternatives --remove asterisk-prompt-en-us /usr/share/asterisk/sounds/en_US_f_Allison
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