Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 295236)
+++ channels/chan_sip.c	(working copy)
@@ -5631,8 +5631,10 @@
 }
 
 /*! \brief Convert SIP hangup causes to Asterisk hangup causes */
-int hangup_sip2cause(int cause)
+int hangup_sip2cause(int cause, char* text)
 {
+	char *ptr;
+
 	/* Possible values taken from causes.h */
 
 	switch(cause) {
@@ -5662,8 +5664,10 @@
 			return AST_CAUSE_INTERWORKING;
 		case 420:	/* Bad extension */
 			return AST_CAUSE_NO_ROUTE_DESTINATION;
-		case 480:	/* No answer */
-			return AST_CAUSE_NO_ANSWER;
+		case 480:	/* Temporarily unavailabe / Do not disturb */
+			ptr=strcasestr(text, "do");
+			if (ptr) if (strcasestr(text, "disturb")>ptr) return AST_CAUSE_CALL_REJECTED;
+			return AST_CAUSE_UNAVAILABLE;
 		case 481:	/* No answer */
 			return AST_CAUSE_INTERWORKING;
 		case 482:	/* Loop detected */
@@ -9847,7 +9851,7 @@
 			} else {
 				int respcode;
 				if (sscanf(msg, "%30d ", &respcode))
-					hangupcause = hangup_sip2cause(respcode);
+					hangupcause = hangup_sip2cause(respcode, "");
 			}
 
 			if (hangupcause) {
@@ -19804,7 +19808,7 @@
 		}
 
 		if (!owner->hangupcause)
-			owner->hangupcause = hangup_sip2cause(resp);
+		  owner->hangupcause = hangup_sip2cause(resp,REQ_OFFSET_TO_STR(req,rlPart2));
 	}
 
 	if (p->socket.type == SIP_TRANSPORT_UDP) {
Index: channels/sip/include/sip_utils.h
===================================================================
--- channels/sip/include/sip_utils.h	(revision 295236)
+++ channels/sip/include/sip_utils.h	(working copy)
@@ -44,7 +44,7 @@
 
 
 /*! \brief Convert SIP hangup causes to Asterisk hangup causes */
-int hangup_sip2cause(int cause);
+int hangup_sip2cause(int cause, char *text);
 
 /*! \brief Convert Asterisk hangup causes to SIP codes
 \verbatim
Index: include/asterisk/causes.h
===================================================================
--- include/asterisk/causes.h	(revision 295236)
+++ include/asterisk/causes.h	(working copy)
@@ -63,6 +63,7 @@
 	- AST_CAUSE_SWITCH_CONGESTION               42
 	- AST_CAUSE_ACCESS_INFO_DISCARDED           43
 	- AST_CAUSE_REQUESTED_CHAN_UNAVAIL          44
+	- AST_CAUSE_UNAVAILABLE			    48
 	- AST_CAUSE_FACILITY_NOT_SUBSCRIBED         50
 	- AST_CAUSE_OUTGOING_CALL_BARRED            52
 	- AST_CAUSE_INCOMING_CALL_BARRED            54
@@ -122,6 +123,7 @@
 #define AST_CAUSE_SWITCH_CONGESTION             42
 #define AST_CAUSE_ACCESS_INFO_DISCARDED         43
 #define AST_CAUSE_REQUESTED_CHAN_UNAVAIL        44
+#define AST_CAUSE_UNAVAILABLE			48
 #define AST_CAUSE_FACILITY_NOT_SUBSCRIBED       50
 #define AST_CAUSE_OUTGOING_CALL_BARRED          52
 #define AST_CAUSE_INCOMING_CALL_BARRED          54