Re: IP Communicator via VPN not able to receive calls
You'll need a VPN solution that gives an address to clients that is routable - i.e. new unsolicited UDP streams can get back to the client as calls are set up, as well as new TCP connections for call setup.
You can get problems where IP Comm picks up the local LAN IP and uses that as it's address in call setup messages, in these situations you need to set the actual VPN address in the preferences in the app, or use a URL that you returns the IP of the client dynamically.
This is basically because (as you mentioned NAT) most NAT systems will NAT the network-layer IP address, but not the addresses embedded in higher layer protocols (i.e. SCCP) - PIX's have (I believe) a fixup command that allows them to NAT the addresses in SCCP packets.
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