diff --git a/hosts/carbon/configuration.nix b/hosts/carbon/configuration.nix
index 9508a93..e585000 100644
--- a/hosts/carbon/configuration.nix
+++ b/hosts/carbon/configuration.nix
@@ -9,6 +9,7 @@
       ./dns.nix
       ./net-gastnetz.nix
       ./net-heimnetz.nix
+      ./net-voip.nix
       ./ppp.nix
     ];
 
@@ -49,14 +50,6 @@
     id = 102;
     interface = "enp1s0";
   };
-  ## VoIP
-  networking.vlans."enp1s0.204" = {
-    id = 204;
-    interface = "enp1s0";
-  };
-  networking.interfaces."enp1s0.204".ipv4.addresses = [
-    { address = "10.152.33.1"; prefixLength = 24; }
-  ];
 
   # Use Anycast Nameservers
   networking.nameservers = [ "fd00:152:152::1" "10.152.0.1" ];
@@ -75,7 +68,6 @@
     enable = true;
     settings = {
       interfaces-config = {
-        interfaces = [ "enp1s0.204" ];
         service-sockets-max-retries = 15;
         service-sockets-retry-wait-time = 2000;
       };
@@ -84,89 +76,6 @@
         persist = true;
         type = "memfile";
       };
-      option-def = [
-        {
-          space = "dhcp4";
-          name = "vendor-encapsulated-options";
-          code = 43;
-          type = "empty";
-          encapsulate = "sipdect";
-        }
-        {
-          space = "sipdect";
-          name = "ommip1";
-          code = 10;
-          type = "ipv4-address";
-        }
-        {
-          space = "sipdect";
-          name = "ommip2";
-          code = 19;
-          type = "ipv4-address";
-        }
-        {
-          space = "sipdect";
-          name = "syslogip";
-          code = 14;
-          type = "ipv4-address";
-        }
-        {
-          space = "sipdect";
-          name = "syslogport";
-          code = 15;
-          type = "int16";
-        }
-        {
-          space = "dhcp4";
-          name = "magic_str";
-          code = 224;
-          type = "string";
-        }
-      ];
-      subnet4 = [
-        # VoIP
-        {
-          id = 204;
-          subnet = "10.152.33.0/24";
-          pools = [
-            {
-              pool = "10.152.33.10 - 10.152.33.200";
-            }
-          ];
-          option-data = [
-            {
-              name = "routers";
-              data = "10.152.33.1";
-            }
-          ];
-
-          reservations = [
-            {
-              hostname = "iridium";
-              hw-address = "00:30:42:1B:8C:7C";
-              ip-address = "10.152.33.11";
-              option-data = [
-                {
-                  name = "host-name";
-                  data = "iridium";
-                }
-                {
-                  name = "vendor-encapsulated-options";
-                }
-                {
-                  space = "sipdect";
-                  name = "ommip1";
-                  data = "10.152.33.11";
-                }
-                {
-                  name = "magic_str";
-                  data = "OpenMobilitySIP-DECT";
-                }
-              ];
-            }
-          ];
-        }
-      ];
     };
   };
 
diff --git a/hosts/carbon/net-voip.nix b/hosts/carbon/net-voip.nix
new file mode 100644
index 0000000..3a816fc
--- /dev/null
+++ b/hosts/carbon/net-voip.nix
@@ -0,0 +1,105 @@
+{ ... }:
+
+{
+
+  ## VoIP
+  networking.vlans."enp1s0.204" = {
+    id = 204;
+    interface = "enp1s0";
+  };
+  networking.interfaces."enp1s0.204".ipv4.addresses = [
+    { address = "10.152.33.1"; prefixLength = 24; }
+  ];
+
+  services.kea.dhcp4 = {
+    settings = {
+      interfaces-config = {
+        interfaces = [ "enp1s0.204" ];
+      };
+      option-def = [
+        {
+          space = "dhcp4";
+          name = "vendor-encapsulated-options";
+          code = 43;
+          type = "empty";
+          encapsulate = "sipdect";
+        }
+        {
+          space = "sipdect";
+          name = "ommip1";
+          code = 10;
+          type = "ipv4-address";
+        }
+        {
+          space = "sipdect";
+          name = "ommip2";
+          code = 19;
+          type = "ipv4-address";
+        }
+        {
+          space = "sipdect";
+          name = "syslogip";
+          code = 14;
+          type = "ipv4-address";
+        }
+        {
+          space = "sipdect";
+          name = "syslogport";
+          code = 15;
+          type = "int16";
+        }
+        {
+          space = "dhcp4";
+          name = "magic_str";
+          code = 224;
+          type = "string";
+        }
+      ];
+      subnet4 = [
+        # VoIP
+        {
+          id = 204;
+          subnet = "10.152.33.0/24";
+          pools = [
+            {
+              pool = "10.152.33.10 - 10.152.33.200";
+            }
+          ];
+          option-data = [
+            {
+              name = "routers";
+              data = "10.152.33.1";
+            }
+          ];
+
+          reservations = [
+            {
+              hostname = "iridium";
+              hw-address = "00:30:42:1B:8C:7C";
+              ip-address = "10.152.33.11";
+              option-data = [
+                {
+                  name = "host-name";
+                  data = "iridium";
+                }
+                {
+                  name = "vendor-encapsulated-options";
+                }
+                {
+                  space = "sipdect";
+                  name = "ommip1";
+                  data = "10.152.33.11";
+                }
+                {
+                  name = "magic_str";
+                  data = "OpenMobilitySIP-DECT";
+                }
+              ];
+            }
+          ];
+        }
+      ];
+    };
+  };
+
+}