One thing that I've found with the old SunRocket innomedia ATA is that if you configure it to use both lines (obviously with 2 different voxalot accounts), then at least one of the voxalot accounts must have symmetric NAT translation set to NO. If both accounts have YES for symmetric NAT translation, then the adapter acts very flaky with respect to incomming calls.
Perhaps this is true of any ATA with two lines. Since the SIP signaling port is the same for both lines, only one set of bogus UDP packets is necessary to keep the port open through the NAT box anyway.
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