I don't know much about the Voxalot proxies, but some proxies will ban your ATA for a period of time if it tries to register too often. In Linksys ATAs the default registration retry interval (Reg Retry Intvl) of 30 seconds is too often! For better results try 300 seconds.
This problem happened to me when I was using proxy01.sipphone.com. The problem started when there was some kind of brief one-way blockage in the Internet which allowed my ATA's registration request to reach the proxy but the proxy's reply did not reach my ATA. Of course my ATA retried the registration 30 seconds later. After some reties, I don't know exactly how many, the proxy banned my ATA. To get un-banned I had to turn off my ATA overnight.
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