Index: pbx.c
===================================================================
--- pbx.c	(revision 34336)
+++ pbx.c	(working copy)
@@ -4938,7 +4998,7 @@
 static int pbx_builtin_busy(struct ast_channel *chan, void *data)
 {
 	ast_indicate(chan, AST_CONTROL_BUSY);
-	ast_setstate(chan, AST_STATE_BUSY);
+	/* ast_setstate(chan, AST_STATE_BUSY); Removed because this breaks chan_sip.  See mantis bug XXXX */
 	wait_for_hangup(chan, data);
 	return -1;
 }
@@ -4949,7 +5009,7 @@
 static int pbx_builtin_congestion(struct ast_channel *chan, void *data)
 {
 	ast_indicate(chan, AST_CONTROL_CONGESTION);
-	ast_setstate(chan, AST_STATE_BUSY);
+	/* ast_setstate(chan, AST_STATE_BUSY); Removed because this breaks chan_sip.  See mantis bug XXXX */
 	wait_for_hangup(chan, data);
 	return -1;
 }