Store the NAT policy in the media session, not in the call session.

src/conference/session/call-session-p.h

@@ -93,7 +93,6 @@ protected:
 	LinphoneProxyConfig *destProxy = nullptr;
 	LinphoneErrorInfo *ei = nullptr;
 	LinphoneCallLog *log = nullptr;
-	LinphoneNatPolicy *natPolicy = nullptr;
 
 	SalOp *op = nullptr;
 

src/conference/session/call-session.cpp

@@ -59,8 +59,6 @@ CallSessionPrivate::~CallSessionPrivate () {
 		linphone_error_info_unref(ei);
 	if (log)
 		linphone_call_log_unref(log);
-	if (natPolicy)
-		linphone_nat_policy_unref(natPolicy);
 	if (op)
 		sal_op_release(op);
 }
@@ -786,12 +784,6 @@ void CallSession::configure (LinphoneCallDir direction, LinphoneProxyConfig *cfg
 	}
 	d->log = linphone_call_log_new(direction, fromAddr, toAddr);
 
-	if (d->destProxy)
-		d->natPolicy = linphone_proxy_config_get_nat_policy(d->destProxy);
-	if (!d->natPolicy)
-		d->natPolicy = linphone_core_get_nat_policy(d->core);
-	linphone_nat_policy_ref(d->natPolicy);
-
 	if (op) {
 		/* We already have an op for incoming calls */
 		d->op = op;

src/conference/session/media-session-p.h

@@ -261,6 +261,7 @@ private:
 	RtpProfile *textProfile = nullptr;
 	int mainTextStreamIndex = LINPHONE_CALL_STATS_TEXT;
 
+	LinphoneNatPolicy *natPolicy = nullptr;
 	StunClient *stunClient = nullptr;
 	IceAgent *iceAgent = nullptr;
 

src/conference/session/media-session.cpp

@@ -103,6 +103,8 @@ MediaSessionPrivate::~MediaSessionPrivate () {
 		linphone_call_stats_unref(videoStats);
 	if (textStats)
 		linphone_call_stats_unref(textStats);
+	if (natPolicy)
+		linphone_nat_policy_unref(natPolicy);
 	if (stunClient)
 		delete stunClient;
 	delete iceAgent;
@@ -4087,6 +4089,12 @@ void MediaSession::configure (LinphoneCallDir direction, LinphoneProxyConfig *cf
 	L_D(MediaSession);
 	CallSession::configure (direction, cfg, op, from, to);
 
+	if (d->destProxy)
+		d->natPolicy = linphone_proxy_config_get_nat_policy(d->destProxy);
+	if (!d->natPolicy)
+		d->natPolicy = linphone_core_get_nat_policy(d->core);
+	linphone_nat_policy_ref(d->natPolicy);
+
 	if (direction == LinphoneCallOutgoing) {
 		d->selectOutgoingIpVersion();
 		d->getLocalIp(to);