First thing to know is that everything that has a DN can be used for routing, so it's a good idea to look at the route plan report to find matches.
If you can't find an exact match, chances are you're hitting something with wildcards ie X, [1-2], etc
An easy way to check routing if you're new to the game is to use DNA
Cisco Unified Communications Manager Dialed Number Analyzer Guide, Release 6.1(1)
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/dna/6_1_1/bw-dna.html
HTH
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www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate