any way to know my voip suppler is symmetric NAT or not
 

quote
"New symmetric NAT handling setting

a). A new field has been added to the member details page that allows members to turn on/off VoXaLot NAT handling. This option is useful for disabling NAT handling for non symmetric NAT de vices such as the Cisco 7961G.
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So how to know or test my voip suppler is symmetric NAT or not