I use Shorewall as firewall in my asterisk box but I am having troubles with configuring the rules. The only way I found in order that all my sip calls work correctly is to allow all ports to be open, which I think is not acceptable.
I thought a good way to get rid of all these may be using a sip-aware firewall. Does anybody use any kind of sip-awares? or could somebody explain how to configure my shorewall to work fine while remaining risk-free?
thanks in advance