Function to remove sip

src/freedombone-app-sip

 VOIP_TURN_TLS_PORT=5349
 VOIP_TURN_NONCE=
 
+function remove_sip {
+	if ! grep -Fxq "install_sip" $COMPLETION_FILE; then
+		return
+	fi
+	iptables -D INPUT -p udp --dport $VOIP_TURN_PORT -j ACCEPT
+	iptables -D INPUT -p tcp --dport $VOIP_TURN_PORT -j ACCEPT
+	iptables -D INPUT -p tcp --dport $VOIP_TURN_TLS_PORT -j ACCEPT
+	iptables -D INPUT -p udp --dport $SIP_PORT -j ACCEPT
+	iptables -D INPUT -p tcp --dport $SIP_PORT -j ACCEPT
+	iptables -D INPUT -p udp --dport $SIP_TLS_PORT -j ACCEPT
+	iptables -D INPUT -p tcp --dport $SIP_TLS_PORT -j ACCEPT
+	function_check save_firewall_settings
+	save_firewall_settings
+
+	function_check remove_onion_service
+	remove_onion_service sip ${SIP_PORT}
+
+	apt-get -y remove --purge sipwitch
+	apt-get -y remove --purge turnserver
+	if [ -f /etc/sipwitch.conf ]; then
+		rm /etc/sipwitch.conf
+	fi
+	if [ -d /etc/turnserver ]; then
+		rm -rf /etc/turnserver
+	fi
+	sed -i '/install_sip/d' $COMPLETION_FILE
+	sed -i '/configure_firewall_for_voip_turn/d' $COMPLETION_FILE
+	sed -i '/configure_firewall_for_sip4/d' $COMPLETION_FILE
+}
+
 function configure_firewall_for_voip_turn {
 	if [[ $SYSTEM_TYPE == "$VARIANT_WRITER" || $SYSTEM_TYPE == "$VARIANT_MAILBOX" || $SYSTEM_TYPE == "$VARIANT_CLOUD" || $SYSTEM_TYPE == "$VARIANT_SOCIAL" || $SYSTEM_TYPE == "$VARIANT_MEDIA" || $SYSTEM_TYPE == "$VARIANT_DEVELOPER" ]]; then
 		return