Index: cdr.c
===================================================================
--- cdr.c	(revision 7258)
+++ cdr.c	(working copy)
@@ -256,6 +256,8 @@
 		snprintf(workspace, workspacelen, "%d", cdr->billsec);
 	else if (!strcasecmp(name, "disposition"))
 		ast_copy_string(workspace, ast_cdr_disp2str(cdr->disposition), workspacelen);
+	else if (!strcasecmp(name, "hangupcause"))
+		snprintf(workspace, workspacelen, "%d", cdr->hangupcause);
 	else if (!strcasecmp(name, "amaflags"))
 		ast_copy_string(workspace, ast_cdr_flags2str(cdr->amaflags), workspacelen);
 	else if (!strcasecmp(name, "accountcode"))
@@ -274,8 +276,8 @@
 /* readonly cdr variables */
 static	const char *cdr_readonly_vars[] = { "clid", "src", "dst", "dcontext", "channel", "dstchannel",
 				    "lastapp", "lastdata", "start", "answer", "end", "duration",
-				    "billsec", "disposition", "amaflags", "accountcode", "uniqueid",
-				    "userfield", NULL };
+				    "billsec", "disposition", "hangupcause", "amaflags", "accountcode",
+					"uniqueid", "userfield", NULL };
 /*! Set a CDR channel variable 
 	\note You can't set the CDR variables that belong to the actual CDR record, like "billsec".
 */
@@ -618,6 +620,7 @@
 			ast_copy_string(cdr->src, num ? num : "", sizeof(cdr->src));
 
 			cdr->disposition = (c->_state == AST_STATE_UP) ?  AST_CDR_ANSWERED : AST_CDR_NOANSWER;
+			cdr->hangupcause = 0;
 			cdr->amaflags = c->amaflags ? c->amaflags :  ast_default_amaflags;
 			ast_copy_string(cdr->accountcode, c->accountcode, sizeof(cdr->accountcode));
 			/* Destination information */
@@ -730,6 +733,18 @@
 	return 0;
 }
 
+int ast_cdr_sethangupcause(struct ast_channel *chan)
+{
+	struct ast_cdr *cdr = chan->cdr;
+
+	while (cdr) {
+		if (!ast_test_flag(cdr, AST_CDR_FLAG_LOCKED))
+			cdr->hangupcause = chan->hangupcause;
+		cdr = cdr->next;
+	}
+	return 0;
+}
+
 int ast_cdr_update(struct ast_channel *c)
 {
 	struct ast_cdr *cdr = c->cdr;
Index: channel.c
===================================================================
--- channel.c	(revision 7258)
+++ channel.c	(working copy)
@@ -1302,6 +1302,7 @@
 	chan->generatordata = NULL;
 	chan->generator = NULL;
 	if (chan->cdr) {		/* End the CDR if it hasn't already */ 
+		ast_cdr_sethangupcause(chan);
 		ast_cdr_end(chan->cdr);
 		ast_cdr_detach(chan->cdr);	/* Post and Free the CDR */ 
 		chan->cdr = NULL;
Index: doc/README.cdr
===================================================================
--- doc/README.cdr	(revision 7258)
+++ doc/README.cdr	(working copy)
@@ -94,6 +94,7 @@
 ${CDR(duration)}		Duration of the call.
 ${CDR(billsec)}			Duration of the call once it was answered.
 ${CDR(disposition)}		ANSWERED, NO ANSWER, BUSY
+${CDR(hangupcause)}		Channel hangup cause
 ${CDR(amaflags)}		DOCUMENTATION, BILL, IGNORE etc
 ${CDR(accountcode)}		The channel's account code.
 ${CDR(uniqueid)}		The channel's unique id.
Index: doc/README.variables
===================================================================
--- doc/README.variables	(revision 7258)
+++ doc/README.variables	(working copy)
@@ -778,6 +778,7 @@
 ${CDR(duration)}		Duration of the call.
 ${CDR(billsec)}			Duration of the call once it was answered.
 ${CDR(disposition)}		ANSWERED, NO ANSWER, BUSY
+${CDR(hangupcause)}		Channel hangup cause
 ${CDR(amaflags)}		DOCUMENTATION, BILL, IGNORE etc
 ${CDR(accountcode)}		The channel's account code.
 ${CDR(uniqueid)}		The channel's unique id.
Index: include/asterisk/cdr.h
===================================================================
--- include/asterisk/cdr.h	(revision 7258)
+++ include/asterisk/cdr.h	(working copy)
@@ -79,6 +79,8 @@
 	int billsec;				
 	/*! What happened to the call */
 	int disposition;			
+	/*! Why is the channel hanged up */
+	int hangupcause;
 	/*! What flags to use */
 	int amaflags;				
 	/*! What account number to use */
@@ -273,8 +275,8 @@
 
 extern int ast_cdr_setuserfield(struct ast_channel *chan, const char *userfield);
 extern int ast_cdr_appenduserfield(struct ast_channel *chan, const char *userfield);
+extern int ast_cdr_sethangupcause(struct ast_channel *chan);
 
-
 /* Update CDR on a channel */
 extern int ast_cdr_update(struct ast_channel *chan);