Not having the HT502, I don't know what your WAN config options are. However, if you can configure remote access via the WAN link to a custom port number, you can forward that port to the HT502. I've done this with other devices on my network, including my Linksys CallVantage adapter (when I had it). [The nice thing about the Linksys (or Centillium--not sure which) was that if someone was on the phone, it also showed the number of the person on the other end, so I could see who my wife was talking to if I checked in...]
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