Hi everyone!
I have a little problem with voip phones. Recently I have changed te firewall to a Zyxel USG-40, since then the voip phones not working (sometimes a few incoming/outgoing calls, but mostly no connection). I have talked to the Voip company, they said that the phones try to connect to their PBX, but the connection loses almost every time. After I disabled the firewall, the phones worked without any problem. The compan's IT guy told me that I should allow 5060 udp, and tcp 10000-20000 ports outgoing through the firewall. I see I can set up incoming NAT rules, but how to do outgoing?
Thanks in advance
David
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