diff --git a/openbsc/src/bsc/osmo_bsc_vty.c b/openbsc/src/bsc/osmo_bsc_vty.c
index a4ec70d..2c98219 100644
--- a/openbsc/src/bsc/osmo_bsc_vty.c
+++ b/openbsc/src/bsc/osmo_bsc_vty.c
@@ -25,6 +25,9 @@
 
 #include <osmocore/talloc.h>
 
+
+#define IPA_STR "IP.ACCESS specific\n"
+
 extern struct gsm_network *bsc_gsmnet;
 
 static struct osmo_msc_data *osmo_msc_data(struct vty *vty)
@@ -59,6 +62,7 @@
 			data->core_ncc, VTY_NEWLINE);
 	vty_out(vty, "  ip.access rtp-payload %d%s",
 		data->rtp_payload, VTY_NEWLINE);
+	vty_out(vty, "  ip.access rtp-base %d%s", data->rtp_base, VTY_NEWLINE);
 	vty_out(vty, "  ip %s%s", data->msc_ip, VTY_NEWLINE);
 	vty_out(vty, "  port %d%s", data->msc_port, VTY_NEWLINE);
 	vty_out(vty, "  ip-dscp %d%s", data->msc_ip_dscp, VTY_NEWLINE);
@@ -94,7 +98,7 @@
 DEFUN(cfg_net_bsc_rtp_payload,
       cfg_net_bsc_rtp_payload_cmd,
       "ip.access rtp-payload <0-255>",
-      "IP.ACCESS specific\n"
+      IPA_STR
       "Set the rtp-payload for the RTP stream\n"
       "RTP payload number\n")
 {
@@ -103,6 +107,18 @@
 	return CMD_SUCCESS;
 }
 
+DEFUN(cfg_net_bsc_rtp_base,
+      cfg_net_bsc_rtp_base_cmd,
+      "ip.access rtp-base <1-65000>",
+      IPA_STR
+      "Set the rtp-base port for the RTP stream\n"
+      "Port number\n")
+{
+	struct osmo_msc_data *data = osmo_msc_data(vty);
+	data->rtp_base = atoi(argv[0]);
+	return CMD_SUCCESS;
+}
+
 DEFUN(cfg_net_msc_ip,
       cfg_net_msc_ip_cmd,
       "ip A.B.C.D", "Set the MSC/MUX IP address.")
@@ -177,6 +193,7 @@
 	install_element(MSC_NODE, &cfg_net_bsc_token_cmd);
 	install_element(MSC_NODE, &cfg_net_bsc_ncc_cmd);
 	install_element(MSC_NODE, &cfg_net_bsc_rtp_payload_cmd);
+	install_element(MSC_NODE, &cfg_net_bsc_rtp_base_cmd);
 	install_element(MSC_NODE, &cfg_net_msc_ip_cmd);
 	install_element(MSC_NODE, &cfg_net_msc_port_cmd);
 	install_element(MSC_NODE, &cfg_net_msc_prio_cmd);
diff --git a/openbsc/src/gsm_data.c b/openbsc/src/gsm_data.c
index 7ede318..dc8024a 100644
--- a/openbsc/src/gsm_data.c
+++ b/openbsc/src/gsm_data.c
@@ -319,6 +319,7 @@
 	net->msc_data->pong_timeout = 5;
 	net->msc_data->core_ncc = -1;
 	net->msc_data->rtp_payload = 126;
+	net->msc_data->rtp_base = 4000;
 
 	gsm_net_update_ctype(net);