Dial plan problem

[voip2007]

Hi, everyboby,
I have a problem in my dialplan. when I made international call, the call become the local call. my IDD code is 011, NDD code is 1,country code is 1.

my dial plan is as below.
Priority Pattern Replacement Provider ENUM Replacement
50 _ZXXXXXX 1514${EXTEN} voipbuster 1514${EXTEN}
60 _ZXXXXXXXXX 1${EXTEN} voipbuster 1${EXTEN}
80 _011. ${EXTEN} voipbuster ${EXTEN:3}

50 local call in montreal, no problem
60 national call in canada, no problem
80 internation call without dial 011, but not sucessful. I don't understand why it become local call. just like I dial 862012345678, and the call became 15148620123.

Is there anybody can help me?