ShoreTel: How does ShoreTel decide how to route calls?

By default, ShoreTel will follow the decision tree below, unless custom dial strings are introduced. To make the routing decision, the algorithm poses the following questions. For the number dialed, is there:

1. A trunk at the originating site for which the call is local?
2. A trunk at the proxy site for which the call is local?
3. A trunk at any other site for which the call is local?
4. A trunk at the originating site for which the call is considered nearby?
5. A trunk at the proxy site for which the call is considered nearby?
6. A trunk  trunk at any other site for which the call is considered nearby?
7. A trunk at the originating site designated for long distance?
8. A trunk at a proxy site designated for long distance?
9. A trunk at any other site designated for long distance?
10. Any remaining trunk available at originating site?
11. Any remaining trunk available at the proxy site?