FS-3645 --resolve

src/switch_ivr_async.c

@@ -1583,10 +1583,12 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_record_session(switch_core_session_t
 	}
 
 	fh->channels = channels;
-	fh->pre_buffer_datalen = SWITCH_DEFAULT_FILE_BUFFER_LEN;
-
-
 
+	vval = switch_channel_get_variable(channel, "enable_file_write_buffering");
+	if (!vval || switch_true(vval)) {
+		fh->pre_buffer_datalen = SWITCH_DEFAULT_FILE_BUFFER_LEN;
+	}
+	
 	if (!switch_is_file_path(file)) {
 		char *tfile = NULL;
 		char *e;