--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rvinterf/asyncshell/tchrec.c	Sat Jun 11 00:13:35 2016 +0000
@@ -0,0 +1,83 @@
+/*
+ * TCH downlink recording functionality
+ */
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <string.h>
+#include <strings.h>
+#include <stdlib.h>
+#include "pktmux.h"
+#include "tch_feature.h"
+
+extern u_char rvi_msg[];
+extern int rvi_msg_len;
+
+static FILE *gsm_data_file;
+static u_long frame_count;
+
+void
+tch_dlbits_handler()
+{
+	u_char writebytes[33];
+
+	if (!gsm_data_file)
+		return;
+	gsm0610_tidsp_to_libgsm(rvi_msg + 9, writebytes);
+	fwrite(writebytes, 1, 33, gsm_data_file);
+	frame_count++;
+}
+
+static void
+cmd_tch_record_start(filename)
+	char *filename;
+{
+	if (gsm_data_file) {
+		printf("error: tch record session already in progress\n");
+		return;
+	}
+	gsm_data_file = fopen(filename, "w");
+	if (!gsm_data_file) {
+		perror(filename);
+		return;
+	}
+	printf("Starting TCH DL recording\n");
+	tch_rx_control(1);
+	send_tch_config_req(1);
+	frame_count = 0;
+}
+
+static void
+cmd_tch_record_stop()
+{
+	if (!gsm_data_file) {
+		printf("error: no tch record session in progress\n");
+		return;
+	}
+	fclose(gsm_data_file);
+	gsm_data_file = 0;
+	printf("TCH DL recording stopped, captured %lu speech frames\n",
+		frame_count);
+	send_tch_config_req(0);
+}
+
+void
+cmd_tch_record(argc, argv)
+	char **argv;
+{
+	if (argc < 2) {
+		printf("error: too few arguments\n");
+		return;
+	}
+	if (strcmp(argv[1], "stop"))
+		cmd_tch_record_start(argv[1]);
+	else
+		cmd_tch_record_stop();
+}
+
+void
+show_tch_record_status()
+{
+	printf("TCH DL recording: %s\n",
+		gsm_data_file ? "RUNNING" : "not running");
+}