I just set everything back, I am using VD as sip proxy, now it can call out (more important for me), but no call in. It seems to me, after changing the setting, call-out does not work. So, I guess VD does not support, and have to use nonoh as your did.
Anyway, sorry for bothering you these days, and really appreciated your help. I have little time to study, and I am totally a layman for these things, especially come to network staff. Thanks a lot.