diff --git a/debian/ngcp-rtpengine-daemon.init b/debian/ngcp-rtpengine-daemon.init
index 521ffe0d7..0fa309cca 100755
--- a/debian/ngcp-rtpengine-daemon.init
+++ b/debian/ngcp-rtpengine-daemon.init
@@ -90,7 +90,7 @@ case "$1" in
 	  esac
 	fi
 	echo -n "Starting $DESC: $NAME"
-	if [ $TABLE -ge 0 ] && [ "$VIRT" != "yes" ]; then
+	if [ "$TABLE" -ge 0 ] && [ "$VIRT" != "yes" ]; then
 		set +e
 		modprobe xt_MEDIAPROXY
 		if [ -e /proc/mediaproxy/control ]; then
@@ -99,13 +99,13 @@ case "$1" in
 		iptables -N mediaproxy 2> /dev/null
 		iptables -D INPUT -j mediaproxy 2> /dev/null
 		iptables -I INPUT -j mediaproxy
-		iptables -D mediaproxy -p udp -j MEDIAPROXY --id $TABLE 2>/dev/null
-		iptables -I mediaproxy -p udp -j MEDIAPROXY --id $TABLE
+		iptables -D mediaproxy -p udp -j MEDIAPROXY --id "$TABLE" 2>/dev/null
+		iptables -I mediaproxy -p udp -j MEDIAPROXY --id "$TABLE"
 		ip6tables -N mediaproxy 2> /dev/null
 		ip6tables -D INPUT -j mediaproxy 2> /dev/null
 		ip6tables -I INPUT -j mediaproxy
-		ip6tables -D mediaproxy -p udp -j MEDIAPROXY --id $TABLE 2>/dev/null
-		ip6tables -I mediaproxy -p udp -j MEDIAPROXY --id $TABLE
+		ip6tables -D mediaproxy -p udp -j MEDIAPROXY --id "$TABLE" 2>/dev/null
+		ip6tables -I mediaproxy -p udp -j MEDIAPROXY --id "$TABLE"
 		set -e
 	fi
 	start-stop-daemon --start --quiet --pidfile $PIDFILE \
@@ -119,15 +119,15 @@ case "$1" in
 	if [ "$?" -ne 0 ]; then
 		return $?
 	fi
-	if [ $TABLE -ge 0 ] && [ "$VIRT" != "yes" ]; then
+	if [ "$TABLE" -ge 0 ] && [ "$VIRT" != "yes" ]; then
 		set +e
 		if [ -e /proc/mediaproxy/control ]; then
 			echo "del $TABLE" > /proc/mediaproxy/control 2>/dev/null
 		fi
 		iptables -D INPUT -j mediaproxy 2> /dev/null
-		iptables -D mediaproxy -p udp -j MEDIAPROXY --id $TABLE 2>/dev/null
+		iptables -D mediaproxy -p udp -j MEDIAPROXY --id "$TABLE" 2>/dev/null
 		ip6tables -D INPUT -j mediaproxy 2> /dev/null
-		ip6tables -D mediaproxy -p udp -j MEDIAPROXY --id $TABLE 2>/dev/null
+		ip6tables -D mediaproxy -p udp -j MEDIAPROXY --id "$TABLE" 2>/dev/null
 		rmmod xt_MEDIAPROXY 2>/dev/null
 		set -e
 	fi
@@ -156,24 +156,24 @@ case "$1" in
 	      ;;
 	  esac
 	fi
-	if [ $TABLE -ge 0 ] && [ "$VIRT" != "yes" ]; then
+	if [ "$TABLE" -ge 0 ] && [ "$VIRT" != "yes" ]; then
 		sleep 1
 		set +e
 		if [ -e /proc/mediaproxy/control ]; then
 			echo "del $TABLE" > /proc/mediaproxy/control 2>/dev/null
 		fi
 		iptables -D INPUT -j mediaproxy 2> /dev/null
-		iptables -D mediaproxy -p udp -j MEDIAPROXY --id $TABLE 2>/dev/null
+		iptables -D mediaproxy -p udp -j MEDIAPROXY --id "$TABLE" 2>/dev/null
 		ip6tables -D INPUT -j mediaproxy 2> /dev/null
-		ip6tables -D mediaproxy -p udp -j MEDIAPROXY --id $TABLE 2>/dev/null
+		ip6tables -D mediaproxy -p udp -j MEDIAPROXY --id "$TABLE" 2>/dev/null
 		rmmod xt_MEDIAPROXY 2>/dev/null
 		modprobe xt_MEDIAPROXY
 		iptables -N mediaproxy 2> /dev/null
 		iptables -I INPUT -j mediaproxy
-		iptables -I mediaproxy -p udp -j MEDIAPROXY --id $TABLE
+		iptables -I mediaproxy -p udp -j MEDIAPROXY --id "$TABLE"
 		ip6tables -N mediaproxy 2> /dev/null
 		ip6tables -I INPUT -j mediaproxy
-		ip6tables -I mediaproxy -p udp -j MEDIAPROXY --id $TABLE
+		ip6tables -I mediaproxy -p udp -j MEDIAPROXY --id "$TABLE"
 		set -e
 	fi
 	start-stop-daemon --start --quiet --pidfile \
diff --git a/debian/ngcp-rtpengine-daemon.postinst b/debian/ngcp-rtpengine-daemon.postinst
new file mode 100644
index 000000000..5af0f86f6
--- /dev/null
+++ b/debian/ngcp-rtpengine-daemon.postinst
@@ -0,0 +1,35 @@
+#!/bin/sh
+
+set -e
+
+default=/etc/default/ngcp-rtpengine-daemon
+modname=xt_MEDIAPROXY
+
+if [ -x /usr/sbin/ngcp-virt-identify ]; then
+	if /usr/sbin/ngcp-virt-identify --type container; then
+		VIRT="yes"
+	fi
+fi
+
+if [ "$VIRT" = "yes" ]; then
+	echo "Container environment detected. Skip kernel module check"
+else
+	if [ -f $default ]; then
+		. $default || true
+	fi
+
+	if [ "$TABLE" -ge 0 -a -n "$NO_FALLBACK" -a \( "$NO_FALLBACK" = "1" -o "$NO_FALLBACK" = "yes" \) ]; then
+		if lsmod | grep -q $modname || modinfo $modname > /dev/null 2> /dev/null; then
+			true
+		else
+			echo "Kernel module $modname not found and NO_FALLBACK is set."
+			echo "Daemon restart not performed."
+			exit 0
+		fi
+	fi
+fi
+
+#DEBHELPER#
+
+exit 0
+