Preserve the indication currently playing on a channel when a masquerade operation happens. (issue #BE-88)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@90548 65c4cc65-6c06-0410-ace0-fbb531ad65f3

.cleancount

@@ -1 +1 @@
-29
+30

include/asterisk/channel.h

@@ -437,6 +437,8 @@ struct ast_channel {
 	unsigned int emulate_dtmf_duration;	/*!< Number of ms left to emulate DTMF for */
 	struct timeval dtmf_tv;       /*!< The time that an in process digit began, or the last digit ended */
 
+	int visible_indication;                         /*!< Indication currently playing on the channel */
+
 	/*! \brief Data stores on the channel */
 	AST_LIST_HEAD_NOLOCK(datastores, ast_datastore) datastores;
 };

main/channel.c

@@ -1817,6 +1817,7 @@ int ast_answer(struct ast_channel *chan)
 	default:
 		break;
 	}
+	chan->visible_indication = 0;
 	ast_channel_unlock(chan);
 	return res;
 }
@@ -2608,6 +2609,7 @@ int ast_indicate_data(struct ast_channel *chan, int condition, const void *data,
 					ast_log(LOG_DEBUG, "Driver for channel '%s' does not support indication %d, emulating it\n", chan->name, condition);
 				ast_playtones_start(chan,0,ts->data, 1);
 				res = 0;
+				chan->visible_indication = condition;
 			} else if (condition == AST_CONTROL_PROGRESS) {
 				/* ast_playtones_stop(chan); */
 			} else if (condition == AST_CONTROL_PROCEEDING) {
@@ -2624,7 +2626,9 @@ int ast_indicate_data(struct ast_channel *chan, int condition, const void *data,
 				res = -1;
 			}
 		}
-	}
+	} else
+		chan->visible_indication = condition;
+
 	return res;
 }
 
@@ -3837,6 +3841,10 @@ int ast_do_masquerade(struct ast_channel *original)
 	} else
 		ast_log(LOG_WARNING, "Channel type '%s' does not have a fixup routine (for %s)!  Bad things may happen.\n",
 			original->tech->type, original->name);
+
+	/* If an indication is currently playing maintain it on the channel that is taking the place of original */
+	if (original->visible_indication)
+		ast_indicate(original, original->visible_indication);
 	
 	/* Now, at this point, the "clone" channel is totally F'd up.  We mark it as
 	   a zombie so nothing tries to touch it.  If it's already been marked as a