Assuming you mean the firewall in front of the client, you don't need to open 
any ports as long as the VPN client is tunneling all traffic to and from the 
Asterisk server.

I  set NAT=yes in the config file for the extensions behind a VPN.

-Dave

From: asterisk-users-boun...@lists.digium.com 
[mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Marco Sambo
Sent: Tuesday, May 26, 2009 11:21 AM
To: asterisk-users@lists.digium.com
Subject: [asterisk-users] SIP over VPN

Hi all,
I have a question. I have a VPN and I want to use a SIP softphone on my 
notebook using with asterisk. But I have some problem with firewall and port.
Someone knows which ports I should open on my firewall??? I can't connect ...

Thanks all.

Marco
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