How to route to next-hop after a Cancel

Hello Everyone,

I've a question regarding a next-hop on a Local-Policy:
If any Local-Policy is triggered by it's context and should try every Hop listed, unless the call is answered, how am I suppose to consider even the Cancel Events that may occur?

Let's give an unorthodox example:

A Calls B, B calls C ; B calls D.

In this case:
A stands for the Origin DDI (100)
B stands for the Oracle SBC
C stands for the 1st Hop (iPBX1)
D stands for the 2nd Hop (iPBX2)

In this case, I intend to call to iPBX2 only if the call on the iPBX1 was not answered. Any call with an answer bases on codes 5xx or 4xx should always hop to the iPBX2 (2nd Hop). I would to know specifically on the "Cancel" Code