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

let
  asteriskDir = ./asterisk;
  asteriskFiles = builtins.readDir asteriskDir;
  fileNames = builtins.attrNames asteriskFiles;
  entries = builtins.map (name: {
    name = name;
    path = "${asteriskDir}/${name}";
  }) fileNames;
in
{
  config =
    let
      configFarm = pkgs.linkFarm "asterisk-config" entries;
    in
    {
      services.getty.autologinUser = "root";

      systemd.services.asterisk = {
        wantedBy = [ "multi-user.target" ];
        serviceConfig = {
          ExecStart = "${pkgs.asterisk}/bin/asterisk -f -C ${configFarm}/asterisk.conf";
          Restart = "on-failure";
          User = "asterisk";
        };
      };

      users.users.asterisk = {
        isSystemUser = true;
        group = "asterisk";
      };
      users.groups.asterisk = { };

      environment.etc."asterisk".source = configFarm;

      networking.firewall.allowedTCPPorts = [ 5060 ];
      networking.firewall.allowedUDPPorts = [
        5060
        4569
      ];
    };
}