diff --git a/lib/admin/Controller/subscriber.pm b/lib/admin/Controller/subscriber.pm
index d9ae3d5..35879c4 100644
--- a/lib/admin/Controller/subscriber.pm
+++ b/lib/admin/Controller/subscriber.pm
@@ -573,7 +573,7 @@ sub add_permanent_contact : Local {
     my $subscriber_id = $c->request->params->{subscriber_id};
     my $contact = $c->request->params->{contact};
 
-    unless($contact =~ /^sip\:[a-zA-Z0-9\-\_\.\!\~\*\'\(\)\%]+\@[a-zA-Z0-9\-\.\[\]\:]+(\:\d{1,5})?$/) {
+    unless($contact =~ /^sip\:[a-zA-Z0-9\-\_\.\!\~\*\'\(\)\%\+]+\@[a-zA-Z0-9\-\.\[\]\:]+(\:\d{1,5})?$/) {
         $c->session->{messages}{conterr} = 'Client.Syntax.MalformedUri';
         $c->response->redirect("/subscriber/detail?subscriber_id=$subscriber_id#activeregs");
         return;