Voxalot does not establish a 'sound-connection' because it uses SIP. And though SIP is an established standard, the SIP standard is still not very good at dealing with a flaky NAT router.
SIP needs a clear route from the internet to your ATA, and it is a very good bet that your router with it's current configuration/firmware is just not up to the job. This is why you are getting such flaky service. Voxalot can not do anything about a problem that is on your end.
Just for giggles, connect the ATA directly to your internet connection, bypassing the router. If the problems go away, you established you have a router problem.
A fix could be to update the firmware, preferably to a 3rd party firmware like DD-WRT, and forward some RTP ports to the ATA. It would be wise to update the ATA firmware also, is possible.
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