I put a small Asterisk based VoIP appliance behind my test NethServer appliance today. I forwarded the sip ports and management interface ports to the VoIP appliance’s IP.
I can access the web interface for the VoIP appliance externally, I can call in and out, but all voice traffic is being blocked; there’s always silence on the line.
I don’t see anything relevant being logged in firewall.log. I’ve tried restarting shorewall in debug mode. I still see(hear ) the same result. I temporarily put a cheap Linksys router in place with the same port forwards and it works perfectly.
Can anyone else give me ideas of things I should look at and/or try?