diff --git a/machines/forms.py b/machines/forms.py
index 8ea1b469..6a8d8d27 100644
--- a/machines/forms.py
+++ b/machines/forms.py
@@ -64,6 +64,12 @@ class AliasForm(ModelForm):
         model = Alias
         fields = ['alias','extension']
 
+    def __init__(self, *args, **kwargs):
+        infra = kwargs.pop('infra')
+        super(AliasForm, self).__init__(*args, **kwargs)
+        if not infra:
+            self.fields['extension'].queryset = Extension.objects.filter(need_infra=False)
+ 
 class DelAliasForm(ModelForm):
     alias = forms.ModelMultipleChoiceField(queryset=Alias.objects.all(), label="Alias actuels",  widget=forms.CheckboxSelectMultiple)
 
@@ -113,7 +119,7 @@ class DelIpTypeForm(ModelForm):
 class ExtensionForm(ModelForm):
     class Meta:
         model = Extension
-        fields = ['name', 'origin']
+        fields = ['name', 'need_infra', 'origin']
 
     def __init__(self, *args, **kwargs):
         super(ExtensionForm, self).__init__(*args, **kwargs)
@@ -124,7 +130,7 @@ class DelExtensionForm(ModelForm):
     extensions = forms.ModelMultipleChoiceField(queryset=Extension.objects.all(), label="Extensions actuelles",  widget=forms.CheckboxSelectMultiple)
 
     class Meta:
-        exclude = ['name', 'origin']
+        exclude = ['name', 'need_infra', 'origin']
         model = Extension
 
 class MxForm(ModelForm):
diff --git a/machines/migrations/0033_extension_need_infra.py b/machines/migrations/0033_extension_need_infra.py
new file mode 100644
index 00000000..f603240c
--- /dev/null
+++ b/machines/migrations/0033_extension_need_infra.py
@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('machines', '0032_auto_20161119_1850'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='extension',
+            name='need_infra',
+            field=models.BooleanField(default=False),
+        ),
+    ]
diff --git a/machines/models.py b/machines/models.py
index e094460c..764247ab 100644
--- a/machines/models.py
+++ b/machines/models.py
@@ -44,6 +44,7 @@ class Extension(models.Model):
     PRETTY_NAME = "Extensions dns"
 
     name = models.CharField(max_length=255, unique=True)
+    need_infra = models.BooleanField(default=False)
     origin = models.OneToOneField('IpList', on_delete=models.PROTECT, blank=True, null=True)
 
     def __str__(self):
diff --git a/machines/templates/machines/aff_extension.html b/machines/templates/machines/aff_extension.html
index 5753bf8d..68c03026 100644
--- a/machines/templates/machines/aff_extension.html
+++ b/machines/templates/machines/aff_extension.html
@@ -2,14 +2,16 @@
         <thead>
             <tr>
                 <th>Extension</th>
-                <th>Enregistrement A origin</th>
+                <th>Autorisation infra pour utiliser l'extension</th>
+		<th>Enregistrement A origin</th>
     		<th></th>
             </tr>
         </thead>
         {% for extension in extension_list %}
         <tr>
             <td>{{ extension.name }}</td>
-            <td>{{ extension.origin }}</td>
+            <td>{{ extension.need_infra  }}</td>
+	    <td>{{ extension.origin }}</td>
 	    <td class="text-right">
             {% if is_infra %}
                 {% include 'buttons/edit.html' with href='machines:edit-extension' id=extension.id %}
diff --git a/machines/views.py b/machines/views.py
index 279fea8c..c6829b1f 100644
--- a/machines/views.py
+++ b/machines/views.py
@@ -462,7 +462,7 @@ def add_alias(request, interfaceid):
     if not request.user.has_perms(('cableur',)) and interface.machine.user != request.user:
         messages.error(request, "Vous ne pouvez pas ajouter un alias à une machine d'un autre user que vous sans droit")
         return redirect("/users/profil/" + str(request.user.id))
-    alias = AliasForm(request.POST or None)
+    alias = AliasForm(request.POST or None, infra=request.user.has_perms(('infra',)))
     if alias.is_valid():
         alias = alias.save(commit=False)
         alias.interface_parent = interface
@@ -484,7 +484,7 @@ def edit_alias(request, aliasid):
     if not request.user.has_perms(('cableur',)) and alias_instance.interface_parent.machine.user != request.user:
         messages.error(request, "Vous ne pouvez pas ajouter un alias à une machine d'un autre user que vous sans droit")
         return redirect("/users/profil/" + str(request.user.id))
-    alias = AliasForm(request.POST or None, instance=alias_instance)
+    alias = AliasForm(request.POST or None, instance=alias_instance, infra=request.user.has_perms(('infra',)))
     if alias.is_valid():
         with transaction.atomic(), reversion.create_revision():
             alias_instance = alias.save()