Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 137271)
+++ channels/chan_sip.c	(working copy)
@@ -15810,9 +15810,15 @@
 	sipmethod = find_sip_method(msg);
 
 	owner = p->owner;
-	if (owner) 
+	if (owner) {
 		owner->hangupcause = hangup_sip2cause(resp);
 
+		/* Copy the SIP reason reported by the other end to HANGUPCAUSETEXT chan variable */
+		char hangupcausetext[256];
+		snprintf(hangupcausetext,256,"SIP %s",req->rlPart2);
+		pbx_builtin_setvar_helper(owner,"HANGUPCAUSETEXT",hangupcausetext);
+	}
+
 	/* Acknowledge whatever it is destined for */
 	if ((resp >= 100) && (resp <= 199))
 		__sip_semi_ack(p, seqno, 0, sipmethod);
Index: apps/app_dial.c
===================================================================
--- apps/app_dial.c	(revision 137271)
+++ apps/app_dial.c	(working copy)
@@ -567,6 +567,13 @@
 	char status[256];
 };
 
+static void copy_variable(struct ast_channel *dst,struct ast_channel *src,char *varname)
+{
+	const char *sreason;
+	sreason = pbx_builtin_getvar_helper(src, varname);
+	pbx_builtin_setvar_helper(dst,"HANGUPCAUSETEXT",sreason);
+}
+
 static struct ast_channel *wait_for_answer(struct ast_channel *in,
 	struct chanlist *outgoing, int *to, struct ast_flags64 *peerflags,
 	struct privacy_args *pa,
@@ -656,6 +663,8 @@
 			f = ast_read(winner);
 			if (!f) {
 				in->hangupcause = c->hangupcause;
+				
+				copy_variable(in,c,"HANGUPCAUSETEXT");
 #ifdef HAVE_EPOLL
 				ast_poll_channel_del(in, c);
 #endif
@@ -692,10 +701,14 @@
 					/* If call has been answered, then the eventual hangup is likely to be normal hangup */
 					in->hangupcause = AST_CAUSE_NORMAL_CLEARING;
 					c->hangupcause = AST_CAUSE_NORMAL_CLEARING;
+
 					break;
 				case AST_CONTROL_BUSY:
 					ast_verb(3, "%s is busy\n", c->name);
 					in->hangupcause = c->hangupcause;
+
+					copy_variable(in,c,"HANGUPCAUSETEXT");
+
 					ast_hangup(c);
 					c = o->chan = NULL;
 					ast_clear_flag64(o, DIAL_STILLGOING);
@@ -704,6 +717,9 @@
 				case AST_CONTROL_CONGESTION:
 					ast_verb(3, "%s is circuit-busy\n", c->name);
 					in->hangupcause = c->hangupcause;
+					
+					copy_variable(in,c,"HANGUPCAUSETEXT");
+
 					ast_hangup(c);
 					c = o->chan = NULL;
 					ast_clear_flag64(o, DIAL_STILLGOING);
@@ -1975,8 +1991,10 @@
 				ast_parseable_goto(peer, opt_args[OPT_ARG_CALLEE_GO_ON]);
 				ast_pbx_start(peer);
 			} else {
-				if (!ast_check_hangup(chan))
+				if (!ast_check_hangup(chan)) {
 					chan->hangupcause = peer->hangupcause;
+					copy_variable(chan,peer,"HANGUPCAUSETEXT");
+				}
 				ast_hangup(peer);
 			}
 		}
Index: main/pbx.c
===================================================================
--- main/pbx.c	(revision 137271)
+++ main/pbx.c	(working copy)
@@ -2496,6 +2496,8 @@
 		} else if (!strcmp(var, "HANGUPCAUSE")) {
 			snprintf(workspace, workspacelen, "%d", c->hangupcause);
 			s = workspace;
+		} else if (!strcmp(var,"HANGUPCAUSETEXT")) {
+			s = pbx_builtin_getvar_helper(c, "HANGUPCAUSETEXT");
 		}
 	}
 	if (s == &not_found) { /* look for more */