About ATA and DUAL Talk.
I have two ATA setup with dual talk and I could get to the announcement part with no trouble. I have not tried a real call yet, but seems like it will work.
My router is a linksys, four port type.
I did not do anything special to make it work, exception made of a couple of settings that the people of dual talk are aware of at this point.
It could be a good idea reset the terminal to factory default and start fresh.
Tome, from dual talk could give you the settings needed to connect to their server.
Warning: I tried several other providers, following their indications, on SIP and h323 without sucess. I tried NET2phone and another two or three providers and I got no luck and no response from them.