至少有關鍵字 "doesn't exist"

This is not in service. Please check the number and dial again, yeah. How, the bloodhound I should call me a call. If you could take a look at all. The number you have dialed is not in service. Please check the number and dial again.

　　事實證明老四的英文說的不錯，英文部分識別的一字不差。

　　結論

　　看來中英混合識別的難度還是比較大的。但我想，不管PSTN的語音再怎么變態(tài)，畢竟它是有限的，我們只要采集所有的語音樣本，做到100%識別應該是不難的。