Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 126056)
+++ channels/chan_sip.c	(working copy)
@@ -3457,6 +3457,7 @@
 		case AST_CAUSE_NO_USER_RESPONSE:	/* 18 */
 			return "408 Request Timeout";
 		case AST_CAUSE_NO_ANSWER:		/* 19 */
+		case AST_CAUSE_UNREGISTERED:        /* 20 */
 			return "480 Temporarily unavailable";
 		case AST_CAUSE_CALL_REJECTED:		/* 21 */
 			return "403 Forbidden";
Index: apps/app_dial.c
===================================================================
--- apps/app_dial.c	(revision 125587)
+++ apps/app_dial.c	(working copy)
@@ -341,6 +341,7 @@
 			ast_cdr_failed(chan->cdr); \
 		numcongestion++; \
 		break; \
+	case AST_CAUSE_NO_ROUTE_DESTINATION: \
 	case AST_CAUSE_UNREGISTERED: \
 		if (chan->cdr) \
 			ast_cdr_failed(chan->cdr); \
Index: include/asterisk/causes.h
===================================================================
--- include/asterisk/causes.h	(revision 125587)
+++ include/asterisk/causes.h	(working copy)
@@ -33,6 +33,7 @@
 #define AST_CAUSE_USER_BUSY				17
 #define AST_CAUSE_NO_USER_RESPONSE			18
 #define AST_CAUSE_NO_ANSWER				19
+#define AST_CAUSE_SUBSCRIBER_ABSENT			20
 #define AST_CAUSE_CALL_REJECTED				21
 #define AST_CAUSE_NUMBER_CHANGED			22
 #define AST_CAUSE_DESTINATION_OUT_OF_ORDER		27
@@ -75,7 +76,7 @@
 #define AST_CAUSE_NORMAL 				AST_CAUSE_NORMAL_CLEARING
 #define AST_CAUSE_NOANSWER	 			AST_CAUSE_NO_ANSWER
 #define AST_CAUSE_CONGESTION	 			AST_CAUSE_NORMAL_CIRCUIT_CONGESTION
-#define AST_CAUSE_UNREGISTERED				AST_CAUSE_NO_ROUTE_DESTINATION
+#define AST_CAUSE_UNREGISTERED				AST_CAUSE_SUBSCRIBER_ABSENT
 #define AST_CAUSE_NOTDEFINED 				0
 #define AST_CAUSE_NOSUCHDRIVER				AST_CAUSE_CHAN_NOT_IMPLEMENTED