diff --git a/modules/openstack_project/files/pbx/asterisk/extensions.conf b/modules/openstack_project/files/pbx/asterisk/extensions.conf
index 9050b16f03..1a22bee879 100644
--- a/modules/openstack_project/files/pbx/asterisk/extensions.conf
+++ b/modules/openstack_project/files/pbx/asterisk/extensions.conf
@@ -17,8 +17,8 @@ exten => s,1,Answer()
     same => n,Hangup()
 
 ; Default setup for a Conference bridge.
-;   Conferences are 6000 - 6999
-exten => _6XXX,1,Answer()
+;   Conferences are 6000 - 7999
+exten => _[67]XXX,1,Answer()
     same => n,ConfBridge(${EXTEN},,,sample_user_menu)
     same => n,Hangup()