diff --git a/src/include/switch_nat.h b/src/include/switch_nat.h
index 38bf23c8db..ebcbf2f090 100644
--- a/src/include/switch_nat.h
+++ b/src/include/switch_nat.h
@@ -59,9 +59,22 @@ typedef enum {
   \note Generally called by the core_init
 */
 SWITCH_DECLARE(void) switch_nat_init(switch_memory_pool_t *pool);
+/*!
+ \brief Shuts down the NAT Traversal System
+*/
 SWITCH_DECLARE(void) switch_nat_shutdown(void);
 
-SWITCH_DECLARE(switch_status_t) switch_nat_add_mapping(switch_port_t port, switch_nat_ip_proto_t proto);
+/*!
+ \brief Maps a port through the NAT Traversal System
+ \param port Internal port to map
+ \param proto Protocol
+ \param external_port [out] Mapped external port 
+*/
+SWITCH_DECLARE(switch_status_t) switch_nat_add_mapping(switch_port_t port, switch_nat_ip_proto_t proto, switch_port_t *external_port);
+/*!
+ \brief Deletes a NAT mapping
+ \param proto Protocol
+*/
 SWITCH_DECLARE(switch_status_t) switch_nat_del_mapping(switch_port_t port, switch_nat_ip_proto_t proto);
 
 
diff --git a/src/mod/applications/mod_commands/mod_commands.c b/src/mod/applications/mod_commands/mod_commands.c
index 98f3df894f..8288fa6f24 100644
--- a/src/mod/applications/mod_commands/mod_commands.c
+++ b/src/mod/applications/mod_commands/mod_commands.c
@@ -49,6 +49,7 @@ SWITCH_STANDARD_API(nat_map_function)
 	int argc;
 	char *mydata = NULL, *argv[4];
 	switch_nat_ip_proto_t proto = SWITCH_NAT_UDP;
+	switch_port_t external_port = 0;
 
 	if (!cmd) {
 		goto error;
@@ -70,8 +71,8 @@ SWITCH_STANDARD_API(nat_map_function)
 	}
 
 	if (argv[0] && switch_stristr("add", argv[0])) {
-		if (switch_nat_add_mapping((switch_port_t)atoi(argv[1]), proto) == SWITCH_STATUS_SUCCESS) {
-			stream->write_function(stream, "true");
+		if (switch_nat_add_mapping((switch_port_t)atoi(argv[1]), proto, &external_port) == SWITCH_STATUS_SUCCESS) {
+			stream->write_function(stream, "%d", (int)external_port);
 			goto ok;
 		}
 	} else if (argv[0] && switch_stristr("del", argv[0])) {
diff --git a/src/mod/endpoints/mod_sofia/sofia.c b/src/mod/endpoints/mod_sofia/sofia.c
index af813ad975..ea895f19c4 100644
--- a/src/mod/endpoints/mod_sofia/sofia.c
+++ b/src/mod/endpoints/mod_sofia/sofia.c
@@ -762,13 +762,13 @@ void *SWITCH_THREAD_FUNC sofia_profile_thread_run(switch_thread_t *thread, void
 									);
 
 	if (sofia_test_pflag(profile, PFLAG_AUTO_NAT)) {
-		if (switch_nat_add_mapping(profile->sip_port, SWITCH_NAT_UDP) == SWITCH_STATUS_SUCCESS) {
+		if (switch_nat_add_mapping(profile->sip_port, SWITCH_NAT_UDP, NULL) == SWITCH_STATUS_SUCCESS) {
 			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Created UDP nat mapping for %s port %d\n", profile->name, profile->sip_port);
 		}
-		if (switch_nat_add_mapping(profile->sip_port, SWITCH_NAT_TCP) == SWITCH_STATUS_SUCCESS) {
+		if (switch_nat_add_mapping(profile->sip_port, SWITCH_NAT_TCP, NULL) == SWITCH_STATUS_SUCCESS) {
 			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Created TCP nat mapping for %s port %d\n", profile->name, profile->sip_port);
 		}
-		if(sofia_test_pflag(profile, PFLAG_TLS) && switch_nat_add_mapping(profile->tls_sip_port, SWITCH_NAT_TCP) == SWITCH_STATUS_SUCCESS) {
+		if(sofia_test_pflag(profile, PFLAG_TLS) && switch_nat_add_mapping(profile->tls_sip_port, SWITCH_NAT_TCP, NULL) == SWITCH_STATUS_SUCCESS) {
 			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Created TCP/TLS nat mapping for %s port %d\n", profile->name, profile->tls_sip_port);
 		}
 	}
diff --git a/src/mod/endpoints/mod_sofia/sofia_glue.c b/src/mod/endpoints/mod_sofia/sofia_glue.c
index a83336304e..993c002919 100644
--- a/src/mod/endpoints/mod_sofia/sofia_glue.c
+++ b/src/mod/endpoints/mod_sofia/sofia_glue.c
@@ -630,6 +630,7 @@ switch_status_t sofia_glue_tech_choose_port(private_object_t *tech_pvt, int forc
 	switch_port_t sdp_port;
 	char tmp[50];
 	const char *use_ip = NULL;
+	switch_port_t external_port = 0;
 
 	if (!force) {
 		if (switch_channel_test_flag(tech_pvt->channel, CF_PROXY_MODE) ||
@@ -667,12 +668,12 @@ switch_status_t sofia_glue_tech_choose_port(private_object_t *tech_pvt, int forc
 
 	if (tech_pvt->profile->extrtpip && sofia_glue_check_nat(tech_pvt->profile, tech_pvt->remote_ip)) {
 		tech_pvt->adv_sdp_audio_ip = switch_core_session_strdup(tech_pvt->session, tech_pvt->profile->extrtpip);
-		switch_nat_add_mapping((switch_port_t)sdp_port, SWITCH_NAT_UDP);
+		switch_nat_add_mapping((switch_port_t)sdp_port, SWITCH_NAT_UDP, &external_port);
 	} else {
 		tech_pvt->adv_sdp_audio_ip = switch_core_session_strdup(tech_pvt->session, ip);
 	}
 	
-	tech_pvt->adv_sdp_audio_port = sdp_port;
+	tech_pvt->adv_sdp_audio_port = external_port != 0 ? external_port : sdp_port;
 
 	switch_snprintf(tmp, sizeof(tmp), "%d", sdp_port);
 	switch_channel_set_variable(tech_pvt->channel, SWITCH_LOCAL_MEDIA_IP_VARIABLE, tech_pvt->adv_sdp_audio_ip);
@@ -686,6 +687,7 @@ switch_status_t sofia_glue_tech_choose_video_port(private_object_t *tech_pvt, in
 	char *ip = tech_pvt->profile->rtpip;
 	switch_port_t sdp_port;
 	char tmp[50];
+	switch_port_t external_port = 0;
 
 	if (!force) {
 		if (switch_channel_test_flag(tech_pvt->channel, CF_PROXY_MODE) || switch_channel_test_flag(tech_pvt->channel, CF_PROXY_MEDIA)
@@ -712,11 +714,11 @@ switch_status_t sofia_glue_tech_choose_video_port(private_object_t *tech_pvt, in
 		}
 	}
 
-	tech_pvt->adv_sdp_video_port = sdp_port;
-
 	if (sofia_glue_check_nat(tech_pvt->profile, tech_pvt->remote_ip)) {
-		switch_nat_add_mapping((switch_port_t)sdp_port, SWITCH_NAT_UDP);
+		switch_nat_add_mapping((switch_port_t)sdp_port, SWITCH_NAT_UDP, &external_port);
 	}
+	
+	tech_pvt->adv_sdp_video_port = external_port != 0 ? external_port : sdp_port;
 
 	switch_snprintf(tmp, sizeof(tmp), "%d", sdp_port);
 	switch_channel_set_variable(tech_pvt->channel, SWITCH_LOCAL_VIDEO_IP_VARIABLE, tech_pvt->adv_sdp_audio_ip);
diff --git a/src/mod/event_handlers/mod_event_socket/mod_event_socket.c b/src/mod/event_handlers/mod_event_socket/mod_event_socket.c
index 7e3bd13d43..f6b0095fc1 100644
--- a/src/mod/event_handlers/mod_event_socket/mod_event_socket.c
+++ b/src/mod/event_handlers/mod_event_socket/mod_event_socket.c
@@ -2291,7 +2291,7 @@ SWITCH_MODULE_RUNTIME_FUNCTION(mod_event_socket_runtime)
 		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Socket up listening on %s:%u\n", prefs.ip, prefs.port);
 
 		if (prefs.nat_map) {
-			switch_nat_add_mapping(prefs.port, SWITCH_NAT_TCP);
+			switch_nat_add_mapping(prefs.port, SWITCH_NAT_TCP, NULL);
 		}
 
 		break;
diff --git a/src/switch_nat.c b/src/switch_nat.c
index 68b897e6e0..a59533f36f 100644
--- a/src/switch_nat.c
+++ b/src/switch_nat.c
@@ -170,7 +170,7 @@ SWITCH_DECLARE(void) switch_nat_init(switch_memory_pool_t *pool)
 	}
 }
 
-static switch_status_t switch_nat_add_mapping_pmp(switch_port_t port, switch_nat_ip_proto_t proto)
+static switch_status_t switch_nat_add_mapping_pmp(switch_port_t port, switch_nat_ip_proto_t proto, switch_port_t *external_port)
 {
 	switch_status_t status = SWITCH_STATUS_FALSE;
 	natpmpresp_t response;
@@ -198,6 +198,16 @@ static switch_status_t switch_nat_add_mapping_pmp(switch_port_t port, switch_nat
 						  response.type == NATPMP_RESPTYPE_UDPPORTMAPPING ? "UDP" :
 						  (response.type == NATPMP_RESPTYPE_TCPPORTMAPPING ? "TCP" : "UNKNOWN"),
 						  response.pnu.newportmapping.privateport);
+		if (external_port) {
+			*external_port = response.pnu.newportmapping.mappedpublicport;
+		} else if (response.pnu.newportmapping.mappedpublicport != response.pnu.newportmapping.privateport) {
+			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CRIT, "External port %hu protocol %s was not available, it was instead mapped to %hu",
+				response.pnu.newportmapping.privateport,
+				response.type == NATPMP_RESPTYPE_UDPPORTMAPPING ? "UDP" :
+			  	(response.type == NATPMP_RESPTYPE_TCPPORTMAPPING ? "TCP" : "UNKNOWN"),
+				response.pnu.newportmapping.mappedpublicport);
+		}
+						
 		status = SWITCH_STATUS_SUCCESS;
 	}
 
@@ -285,16 +295,20 @@ static switch_status_t switch_nat_del_mapping_upnp(switch_port_t port, switch_na
 	return status;
 }
 
-SWITCH_DECLARE(switch_status_t) switch_nat_add_mapping(switch_port_t port, switch_nat_ip_proto_t proto)
+SWITCH_DECLARE(switch_status_t) switch_nat_add_mapping(switch_port_t port, switch_nat_ip_proto_t proto, switch_port_t *external_port)
 {
 	switch_status_t status = SWITCH_STATUS_FALSE;
 
 	switch (nat_globals.nat_type) {
 	case SWITCH_NAT_TYPE_PMP:
-		status = switch_nat_add_mapping_pmp(port, proto);
+		status = switch_nat_add_mapping_pmp(port, proto, external_port);
 		break;
 	case SWITCH_NAT_TYPE_UPNP:
-		status = switch_nat_add_mapping_upnp(port, proto);
+		if ((status = switch_nat_add_mapping_upnp(port, proto)) && status == SWITCH_STATUS_SUCCESS) {
+			if (external_port) {
+				*external_port = port;
+			}	
+		}
 		break;
 	default:
 		break;