If you examine the North America Numbering Plan file (C:\Program Files\Cisco\DialPlan\NANP), you can see the "nuts and bolts" of how these are implemented. In short,
9 is your trunk access code of choice, 01 is INTERNATIONAL-ACCESS, and the 0 is INTERNATIONAL-OPERATOR.
Same as above, but the last digit '1' is INTERNATIONAL-DIRECT-DIAL.
It is difficult to give comprehensive examples not knowing what your goal is. Here is a random example. If you are interested in something more specific, reply to this message.
9.@ with a route filter COUNTRY-CODE == 7 & "route this pattern"
9.@ with a route filter INTERNATIONAL-ACCESS EXISTS & "block this pattern"
Something like this would block all international calls except those to Russia (country code 7), which would be permitted (the first pattern is more specific). It is possible and perhaps "clearer" to rather say INTERNATIONAL-ACCESS EXISTS AND COUNTRY-CODE == 7, but it is not possible under the NANP to have a COUNTRY-CODE without INTERNATIONAL-ACCESS being dialed, so it's redundant.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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