Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 7284)
+++ channels/chan_sip.c	(working copy)
@@ -2275,6 +2275,7 @@
 /* Possible values taken from causes.h */
 
 	switch(cause) {
+		case 603:	/* Declined */
 		case 403:	/* Not found */
 			return AST_CAUSE_CALL_REJECTED;
 		case 404:	/* Not found */
@@ -2454,7 +2455,7 @@
 				if (ast->hangupcause && ((res = hangup_cause2sip(ast->hangupcause)))) {
 					transmit_response_reliable(p, res, &p->initreq, 1);
 				} else 
-					transmit_response_reliable(p, "403 Forbidden", &p->initreq, 1);
+					transmit_response_reliable(p, "603 Declined", &p->initreq, 1);
 			}
 		} else {	/* Call is in UP state, send BYE */
 			if (!p->pendinginvite) {
Index: pbx.c
===================================================================
--- pbx.c	(revision 7284)
+++ pbx.c	(working copy)
@@ -5503,6 +5503,8 @@
 static int pbx_builtin_hangup(struct ast_channel *chan, void *data)
 {
 	/* Just return non-zero and it will hang up */
+	if (!chan->hangupcause)
+		chan->hangupcause = AST_CAUSE_NORMAL_CLEARING;
 	return -1;
 }