The base functionality of the IX66 is that it understands SIP, so it will rewrite the SIP packets from internal machines in such a way that they will work through NAT.
The SIP Switch functionality lets you have the IX66 register with other service providers on your behalf and then you register to the IX66 directly. You can then establish a dial plan that allows you to select which provider is used in which circumstances.
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Technical questions should be posted to the forums, not sent via PM to me.
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