diff -ru asterisk-13.21.0/main/bridge_channel.c asterisk-13.21.0_changed/main/bridge_channel.c
--- asterisk-13.21.0/main/bridge_channel.c	2018-05-28 14:33:51.116018117 +0200
+++ asterisk-13.21.0_changed/main/bridge_channel.c	2018-05-28 14:35:11.988964598 +0200
@@ -2648,6 +2648,7 @@
 	int res = 0;
 	struct ast_bridge_features *channel_features;
 	struct ast_channel *swap;
+	uint8_t indicate_src_change = 0;
 
 	ast_debug(1, "Bridge %s: %p(%s) is joining\n",
 		bridge_channel->bridge->uniqueid,
@@ -2715,7 +2716,7 @@
 		 */
 		if (!(bridge_channel->bridge->technology->capabilities
 			& AST_BRIDGE_CAPABILITY_MULTIMIX)) {
-			ast_indicate(bridge_channel->chan, AST_CONTROL_SRCCHANGE);
+			indicate_src_change = 1;
 		}
 
 		bridge_channel_impart_signal(bridge_channel->chan);
@@ -2725,6 +2726,10 @@
 		ao2_t_cleanup(swap, "Bridge push with swap successful");
 		swap = NULL;
 
+		if (indicate_src_change) {
+			ast_indicate(bridge_channel->chan, AST_CONTROL_SRCCHANGE);
+		}
+
 		bridge_channel_event_join_leave(bridge_channel, AST_BRIDGE_HOOK_TYPE_JOIN);
 
 		while (bridge_channel->state == BRIDGE_CHANNEL_STATE_WAIT) {