From c236541e29b022d4fef66958ce796165ab15ea44 Mon Sep 17 00:00:00 2001
From: Michael Jerris <mike@jerris.com>
Date: Tue, 21 Sep 2010 14:31:36 -0500
Subject: [PATCH] fix seg on subscribe with no contact host

---
 src/mod/endpoints/mod_sofia/sofia_presence.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/mod/endpoints/mod_sofia/sofia_presence.c b/src/mod/endpoints/mod_sofia/sofia_presence.c
index 5eb71b37e9..333f31b91d 100644
--- a/src/mod/endpoints/mod_sofia/sofia_presence.c
+++ b/src/mod/endpoints/mod_sofia/sofia_presence.c
@@ -1983,12 +1983,20 @@ void sofia_presence_handle_sip_i_subscribe(int status,
 			is_nat = NULL;
 		}
 
+		if (zstr(contact_host)) {
+			is_nat = "No contact host";
+		}
+
 		if (is_nat) {
 			contact_host = network_ip;
 			switch_snprintf(new_port, sizeof(new_port), ":%d", network_port);
 			port = NULL;
 		}
 
+		if (zstr(contact_host)) {
+			nua_respond(nh, 481, "INVALID SUBSCRIPTION", TAG_END());
+			return;
+		}
 
 		if (port) {
 			switch_snprintf(new_port, sizeof(new_port), ":%s", port);