--- asterisk-13.0.1_orig/res/res_monitor.c	2014-07-25 17:47:17.000000000 +0100
+++ asterisk-13.0.1/res/res_monitor.c	2014-12-03 14:48:33.603571849 +0000
@@ -402,6 +402,8 @@
 		} else
 			monitor->write_stream = NULL;
 
+		ast_channel_insmpl_set(chan, 0);
+		ast_channel_outsmpl_set(chan, 0);
 		ast_channel_monitor_set(chan, monitor);
 		ast_monitor_set_state(chan, AST_MONITOR_RUNNING);
 		/* so we know this call has been monitored in case we need to bill for it or something */