From c829766e7a90edb38879ab0bb367fbc9778737b6 Mon Sep 17 00:00:00 2001
From: Brian Davis <brian@scratchwireless.com>
Date: Wed, 29 Apr 2015 15:48:44 -0400
Subject: [PATCH] use is_present_hf to check if Expires header is set

---
 kamailio/registrar-role.cfg | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kamailio/registrar-role.cfg b/kamailio/registrar-role.cfg
index 49d1ccf..60ddf50 100644
--- a/kamailio/registrar-role.cfg
+++ b/kamailio/registrar-role.cfg
@@ -117,7 +117,7 @@ route[ATTEMPT_AUTHORIZATION]
     if(@contact.expires) {
         $var(expires) = @contact.expires;
     } else { 
-        if($hdr(Expires)) {
+        if(is_present_hf("Expires")) {
            $var(expires) = $hdr(Expires);
         } else {
            $var(expires) = REGISTRAR_MIN_EXPIRES;