@xxxx not working, Sip Phone with internetcalls from Betamax

[cunyalen]

I have an internetcalls account "@xxxx". It's starting with @. When I try to set up on the wifi phone, I failed. But another account works. When I try it with eyebeam softphone it works. The wifi phone I used is this: http://www.gtek.com.tw/pwg-500.htm
I wonder what the problem is and how I can solve it.

Another question, I wonder if anybody knows that for voipstunt VoIPIN number, the number depends on the area like a local number or it's just arbitrary?

Thanks a lot.