said by mdshs :Or do I keep the firewall closed on the router and not open any ports at all? Was thinking that the ports should be open but then thinking isn't that a security risk?
My personal preference is to keep ports closed.
VoiP.MS supports the IAX2 protocol, which uses a single UDP port (usually 4569) for both signaling and media flow.
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en.wikipedia.org/wiki/IAX2