jsena

You said there are a variety of UDP codes? That's kinda weird... it should only need one 3-digit code to route to one other site, unless there's something else going on (3-digit to 4-digit conversion, first-digit conversion e.g. 3xxx to 4xxx, ...). Having said that, if you look on the "list aar analysis" page you should see that UDP code. See what route pattern it uses, then do "display route xxx" to see the digit insertion/ trunk choice.

Now that you've got the progression, you can do "change udp 7" if you want to make a different UDP code, followed by adding the new code via "change aar analysis x", followed by a new route, if needed.