diff --git a/src/satip/rtsp.c b/src/satip/rtsp.c
index e194bcc..a4a99e3 100644
--- a/src/satip/rtsp.c
+++ b/src/satip/rtsp.c
@@ -81,6 +81,7 @@ static uint16_t stream_id;
 static char *rtsp_ip = NULL;
 static char *rtsp_nat_ip = NULL;
 static int rtsp_port = -1;
+static int rtsp_nat_port = -1;
 static int rtsp_descramble = 1;
 static int rtsp_rewrite_pmt = 0;
 static int rtsp_muxcnf = MUXCNF_AUTO;
@@ -252,6 +253,7 @@ static char *
 rtsp_check_urlbase(char *u)
 {
   char *p, *s;
+  int t;
 
   if (*u == '/' || strncmp(u, "stream=", 7) == 0)
     return u;
@@ -264,7 +266,8 @@ rtsp_check_urlbase(char *u)
     *p = '\0';
   if ((s = strchr(u, ':')) != NULL) {
     *s = '\0';
-    if (atoi(s + 1) != rtsp_port)
+    t = rtsp_nat_port ?: rtsp_port;
+    if (atoi(s + 1) != t)
       return NULL;
   } else {
 #if 0 /* VLC is broken */
@@ -1393,7 +1396,7 @@ static int
 rtsp_process_play(http_connection_t *hc, int cmd)
 {
   session_t *rs;
-  int errcode = HTTP_STATUS_BAD_REQUEST, valid = 0, i, stream;
+  int errcode = HTTP_STATUS_BAD_REQUEST, valid = 0, i, p, stream;
   char buf[256], *u = tvh_strdupa(hc->hc_url);
   http_arg_list_t args;
 
@@ -1452,8 +1455,9 @@ rtsp_process_play(http_connection_t *hc, int cmd)
     snprintf(buf, sizeof(buf), "%d", rs->stream);
     http_arg_set(&args, "com.ses.streamID", buf);
   } else {
-    if (rtsp_port != 554)
-      snprintf(buf, sizeof(buf), "url=rtsp://%s:%d/stream=%d", rtsp_ip, rtsp_port, rs->stream);
+    p = rtsp_nat_port ?: rtsp_port;
+    if (p != 554)
+      snprintf(buf, sizeof(buf), "url=rtsp://%s:%d/stream=%d", rtsp_ip, p, rs->stream);
     else
       snprintf(buf, sizeof(buf), "url=rtsp://%s/stream=%d", rtsp_ip, rs->stream);
     http_arg_set(&args, "RTP-Info", buf);
@@ -1683,7 +1687,7 @@ rtsp_close_sessions(void)
  */
 void satip_server_rtsp_init
   (const char *bindaddr, int port, int descramble, int rewrite_pmt, int muxcnf,
-   const char *nat_ip)
+   const char *nat_ip, int nat_port)
 {
   static tcp_server_ops_t ops = {
     .start  = rtsp_serve,
@@ -1716,6 +1720,7 @@ void satip_server_rtsp_init
   s = rtsp_nat_ip;
   rtsp_nat_ip = nat_ip ? strdup(nat_ip) : NULL;
   free(s);
+  rtsp_nat_port = nat_port;
   if (!rtsp_server)
     rtsp_server = tcp_server_create(LS_SATIPS, "SAT>IP RTSP", bindaddr, port, &ops, NULL);
   if (reg)
@@ -1738,6 +1743,7 @@ void satip_server_rtsp_done(void)
   pthread_mutex_lock(&global_lock);
   rtsp_server = NULL;
   rtsp_port = -1;
+  rtsp_nat_port = -1;
   free(rtsp_ip);
   free(rtsp_nat_ip);
   rtsp_ip = rtsp_nat_ip = NULL;
diff --git a/src/satip/server.c b/src/satip/server.c
index e6b5fdf..90b28fe 100644
--- a/src/satip/server.c
+++ b/src/satip/server.c
@@ -754,6 +754,16 @@ const idclass_t satip_server_class = {
       .group  = 1,
     },
     {
+      .type   = PT_INT,
+      .id     = "satip_nat_rtsp",
+      .name   = N_("External RTSP port (NAT)"),
+      .desc   = N_("Enter external PORT if behind Forwarding redirection."
+                   "(0 = use the same local port)."),
+      .off    = offsetof(struct satip_server_conf, satip_nat_rtsp),
+      .opts   = PO_EXPERT,
+      .group  = 1,
+    },
+    {
       .type   = PT_BOOL,
       .id     = "satip_nom3u",
       .name   = N_("Disable X_SATIPM3U tag"),
@@ -868,6 +878,7 @@ static void satip_server_init_common(const char *prefix, int announce)
   char http_ip[128];
   int descramble, rewrite_pmt, muxcnf;
   char *nat_ip;
+  int nat_port;
 
   if (satip_server_rtsp_port <= 0)
     return;
@@ -890,13 +901,14 @@ static void satip_server_init_common(const char *prefix, int announce)
   rewrite_pmt = satip_server_conf.satip_rewrite_pmt;
   muxcnf = satip_server_conf.satip_muxcnf;
   nat_ip = strdup(satip_server_conf.satip_nat_ip ?: "");
+  nat_port = satip_server_conf.satip_nat_rtsp ?: satip_server_rtsp_port;
 
   if (announce)
     pthread_mutex_unlock(&global_lock);
 
   pthread_mutex_lock(&satip_server_reinit);
 
-  satip_server_rtsp_init(http_server_ip, satip_server_rtsp_port, descramble, rewrite_pmt, muxcnf, nat_ip);
+  satip_server_rtsp_init(http_server_ip, satip_server_rtsp_port, descramble, rewrite_pmt, muxcnf, nat_ip, nat_port);
   satip_server_info(prefix, descramble, muxcnf);
 
   if (announce)
diff --git a/src/satip/server.h b/src/satip/server.h
index 054e481..bb23271 100644
--- a/src/satip/server.h
+++ b/src/satip/server.h
@@ -62,6 +62,7 @@ struct satip_server_conf {
   int satip_atsc_t;
   int satip_atsc_c;
   char *satip_nat_ip;
+  int satip_nat_rtsp;
 };
 
 extern struct satip_server_conf satip_server_conf;
@@ -92,7 +93,7 @@ int satip_rtsp_delsys(int fe, int *findex, const char **ftype);
 
 void satip_server_rtsp_init(const char *bindaddr, int port,
                             int descramble, int rewrite_pmt, int muxcnf,
-                            const char *nat_ip);
+                            const char *nat_ip, int nat_port);
 void satip_server_rtsp_register(void);
 void satip_server_rtsp_done(void);