{ config, lib, pkgs, ... }:

let cfg = config;
in
{
  config = lib.mkIf cfg.services.asterisk.enable {
    systemd.services.asterisk.preStart = lib.mkMerge [
      (lib.mkAfter ''
        sounds_de="/var/lib/asterisk/sounds/de"
        [ -L "$sounds_de" ] && rm "$sounds_de"
        ln -s "${pkgs.asterisk-sounds-de}/" "$sounds_de"
      '')
    ];
  };
}