it work now

flake.lock

@@ -1,5 +1,21 @@
 {
   "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1652776076,
+        "narHash": "sha256-gzTw/v1vj4dOVbpBSJX4J0DwUR6LIyXo7/SuuTJp1kM=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "04c1b180862888302ddfb2e3ad9eaa63afc60cf8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "ref": "v1.0.0",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1764521362,
@@ -18,6 +34,7 @@
     },
     "root": {
       "inputs": {
+        "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs"
       }
     }

flake.nix

@@ -1,31 +1,40 @@
-{ inputs = {
+{
+  inputs = {
     flake-utils.url = "github:numtide/flake-utils/v1.0.0";
 
     nixpkgs.url = "github:NixOS/nixpkgs/25.11";
   };
 
-  outputs = { flake-utils, nixpkgs, ... }:
-    flake-utils.lib.eachDefaultSystem (system:
+  outputs =
+    { flake-utils, nixpkgs, ... }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
       let
         pkgs = nixpkgs.legacyPackages."${system}";
+        modulesPath = "${pkgs.path}/nixos/modules";
 
-        base = { lib, modulesPath, ... }: {
-          imports = [ "${modulesPath}/virtualisation/qemu-vm.nix" ];
+        base =
+          { lib, modulesPath, ... }:
+          {
+            imports = [ "${modulesPath}/virtualisation/qemu-vm.nix" ];
 
-          # https://github.com/utmapp/UTM/issues/2353
-          networking.nameservers = lib.mkIf pkgs.stdenv.isDarwin [ "8.8.8.8" ];
+            # https://github.com/utmapp/UTM/issues/2353
+            networking.nameservers = lib.mkIf pkgs.stdenv.isDarwin [ "8.8.8.8" ];
 
-          virtualisation = {
-            graphics = false;
+            virtualisation = {
+              graphics = false;
 
-            host = { inherit pkgs; };
+              host = { inherit pkgs; };
+            };
           };
-        };
 
         machine = nixpkgs.lib.nixosSystem {
           system = builtins.replaceStrings [ "darwin" ] [ "linux" ] system;
 
-          modules = [ base ./module.nix ];
+          modules = [
+            base
+            ./module.nix
+          ];
         };
 
         program = pkgs.writeShellScript "run-vm.sh" ''
@@ -37,13 +46,16 @@
         '';
 
       in
-        { packages = { inherit machine; };
+      {
+        packages = { inherit (machine.config.system.build) vm; };
 
-          apps.default = {
-            type = "app";
+        defaultPackage = machine.config.system.build.vm;
 
-            program = "${program}";
-          };
-        }
+        apps.default = {
+          type = "app";
+
+          program = "${program}";
+        };
+      }
     );
 }

module.nix

@@ -5,39 +5,21 @@
   modulesPath,
   ...
 }:
-
-let
-  asteriskDir = ./asterisk;
-  asteriskFilesRaw = builtins.readDir asteriskDir;
-  asteriskFileNames = builtins.attrNames asteriskFilesRaw;
-  filteredFileNames = builtins.filter (n: n != "asterisk.conf") asteriskFileNames;
-  asteriskFiles = builtins.listToAttrs (
-    builtins.map (n: {
-      name = n;
-      value = builtins.readFile (asteriskDir + "/${n}");
-    }) filteredFileNames
-  );
-in
 {
-  imports = [
-    "${modulesPath}/services/networking/asterisk.nix"
+  services.getty.autologinUser = "root";
+  services.asterisk.enable = true;
+  services.asterisk.extraConfig = builtins.readFile ./asterisk/asterisk.conf;
+  services.asterisk.confFiles = builtins.listToAttrs (
+    builtins.map (name: {
+      name = name;
+      value = builtins.readFile (./asterisk + "/${name}");
+    }) (builtins.filter (n: n != "asterisk.conf") (builtins.attrNames (builtins.readDir ./asterisk)))
+  );
+  networking.firewall.allowedTCPPorts = [ 5060 ];
+  networking.firewall.allowedUDPPorts = [
+    5060
+    4569
   ];
-
-  config = {
-    system.stateVersion = "25.11";
-
-    services.asterisk.enable = true;
-
-    services.asterisk.extraConfig = builtins.readFile (asteriskDir + "/asterisk.conf");
-
-    services.asterisk.confFiles = asteriskFiles;
-
-    services.getty.autologinUser = "root";
-
-    networking.firewall.allowedTCPPorts = [ 5060 ];
-    networking.firewall.allowedUDPPorts = [
-      5060
-      4569
-    ];
-  };
+  boot.kernelParams = [ "console=ttyS0" ];
+  system.stateVersion = "25.11";
 }