From 856bc2ef76e1bf3e56d7757d8df36f0cda94edc5 Mon Sep 17 00:00:00 2001
From: Joshua Colp <jcolp@digium.com>
Date: Thu, 27 Dec 2007 17:27:11 +0000
Subject: [PATCH] Use ast_strlen_zero to see if our_contact is set or not on
 the dialog. It is possible for it to be a pointer to NULL. (closes issue
 #11557) Reported by: FuriousGeorge

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@94905 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
 channels/chan_sip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index b943d9b81b..ee01fb6aee 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -5837,7 +5837,7 @@ static int respprep(struct sip_request *resp, struct sip_pvt *p, const char *msg
 			snprintf(contact, sizeof(contact), "%s;expires=%d", p->our_contact, p->expiry);
 			add_header(resp, "Contact", contact);	/* Not when we unregister */
 		}
-	} else if (msg[0] != '4' && p->our_contact[0]) {
+	} else if (msg[0] != '4' && !ast_strlen_zero(p->our_contact)) {
 		add_header(resp, "Contact", p->our_contact);
 	}
 	return 0;