[Efw-user] Asterisk (FreePBX) and Endian Settings

[Vassilis V. <Big...@gm...>]

Hello all!

I am trying the past day to figure out a strange problem with my Endian 
(2.4) and my new Asterisk box. The Asterisk used is a PBX-in-a-flash 
using the FreePBX Web Interface.
I have configured all SIP trunks (4 in total) and the extensions, 
outbound rules and inbound rules. Everything is working as it should.

The problem comes after a ISP disconnect, where I get a new IP address. 
I am on a dynamic IP that is reassigned every 24h. As soon as I get a 
new IP (I can recreate it by doing a reconnect over the endian 
dashboard) the asterisk box cannot connect to 3 of the 4 trunks. The 
only trunk still working is an "internal" trunk registering to another 
asterisk box over OpenVPN. The error I see in the sip registrations is 
that the other 3 connections are "unreachable".

To make the behavior even stranger, as soon as I restart the endian 
firewall, all trunks are registering and there is no problem anymore.

Here are my settings:
- FreePBX -
	Asterisk SIP settings:
		NAT->Yes
		IP Configuration -> Dynamic IP
		Dynamic Host -> <mydnsname>.dyndns.org

	Trunk 1 PEER Details:
		username=xxxxxxxxx
		type=peer
		secret=xxxxxxxxx
		nat=yes
		host=xxxxxx
	Trunk 1 USER Details:
		type=user
		nat=yes
		insecure=very
		context=from-trunk
		canreinvite=no

	Trunk 2 PEER Details:
		username=xxxxxxxx
		type=peer
		secret=xxxxxx
		nat=yes
		insecure=very
		host=sipgate.de
		fromuser=xxxxxxx
		fromdomain=sipgate.de
		outboundproxy=sipgate.de
		disallow=all
		context=from-trunk
		canreinvite=no
		caninvite=no
		allow=ulaw&alaw
	Trunk 2 User Details:
		<empty>
	
	The other trunks have similar settings to the ones above. In trunk 2 I 
also tried entering a outbound proxy but the result is the same as the rest.

- Endian Firewall 2.4 -
	SIP Proxy:
		Enabled
		Transparent
		SIP Port: 5060
		RTP Port Low: 10000	RTP Port High: 20000
		Outbound Proxy Host: <empty>	Port: <empty>
		Yes -> Autosave registrations
		Yes -> Log calls
		Yes -> Firewall logs outgoing connections


I do not have any port forward setup at the moment. My tries to setup 
some rules in Port forwarding/Destination NAT didn't have any effect and 
the Live Log of the firewall doesn't show any packets being dropped.

What am I missing? Has anyone of you successfully configured asterisk 
and endian in such a situation with dynamic IP?

Thank you very much for your time!
Vassilis