帶回中國去GV應該不工作.加拿大可能工作。

The free calls to USA and Canada are only supported by Google if the calls originate from US(maybe Canada as well). This doesn't include calls made from other part of world.

Not sure how exact Google enforces this. One way to do is to check ATA's IP address. Google can deny the service if the IP is not in certain range. 

This is based on my understanding of GV, not first hand experience though.

所有跟帖： 

• 好象OBI可以直接CALL另一個OBI. -st.paul- ♂ (0 bytes) () 04/08/2011 postreply 11:10:01

• 那是ObiTalk，與GV無關.很多VOIP供應商都支持用戶免費互打。 -beHappyLOL- ♀ (67 bytes) () 04/09/2011 postreply 13:52:06