There are a few ways to do it. You can do it in the ars digit conversion table, but it would be better to add the 0 in the routing patterns. For instance, I have two routing patterns for 911: 911 and 11. That way, if a user fails to dial the extra 9 to dial externally, and just dials 911 (system sees this as dialing "11"), it will still go through. The 9 is inserted in the routing pattern. This is required by law in the US. Google "Kari's Law" for more info.
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